[libc++][modules] Fix missing and incorrect includes (#108850)

This patch adds a large number of missing includes in the libc++ headers
and the test suite. Those were found as part of the effort to

[libc++][modules] Fix missing and incorrect includes (#108850)

This patch adds a large number of missing includes in the libc++ headers
and the test suite. Those were found as part of the effort to move
towards a mostly monolithic top-level std module.

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[libc++] fix `shared_ptr`'s incorrect constraints

Fix several bugs:
1. https://llvm.org/PR60258
The conversion constructors' constraint `__compatible_with` incorrectly allow array types conversio

[libc++] fix `shared_ptr`'s incorrect constraints

Fix several bugs:
1. https://llvm.org/PR60258
The conversion constructors' constraint `__compatible_with` incorrectly allow array types conversion to scalar types
2. https://llvm.org/PR53368
The constructor that takes `unique_ptr` are not suffiently constrained.
3. The constructors that take raw pointers incorretly use `__compatible_with`. They have different constraints

Differential Revision: https://reviews.llvm.org/D143346

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[libc++] [test] Add tests for converting array types in shared_ptr.

The only possible kind of a conversion in initialization of a shared
pointer to an array is a qualification conversion (i.e., addi

[libc++] [test] Add tests for converting array types in shared_ptr.

The only possible kind of a conversion in initialization of a shared
pointer to an array is a qualification conversion (i.e., adding
cv-qualifiers). This patch adds tests for converting from `A[]` to
`const A[]` to the following functions:

```
template<class Y> explicit shared_ptr(Y* p);

template<class Y> shared_ptr(const shared_ptr<Y>& r);
template<class Y> shared_ptr(shared_ptr<Y>&& r);

template<class Y> shared_ptr& operator=(const shared_ptr<Y>& r);
template<class Y> shared_ptr& operator=(shared_ptr<Y>&& r);

template<class Y> void reset(Y* p);
template<class Y, class D> void reset(Y* p, D d);
template<class Y, class D, class A> void reset(Y* p, D d, A a);
```

Similar tests for converting functions that involve a `weak_ptr` should
be added once LWG issue [3001](https://cplusplus.github.io/LWG/issue3001)
is implemented.

Differential Revision: https://reviews.llvm.org/D112048

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[libc++] NFC: Fix several GCC warnings in the test suite

- Several -Wshadow warnings
- Several places where we did not initialize our base class explicitly
- Unused variable warnings
- Some tautolog

[libc++] NFC: Fix several GCC warnings in the test suite

- Several -Wshadow warnings
- Several places where we did not initialize our base class explicitly
- Unused variable warnings
- Some tautological comparisons
- Some places where we'd pass null arguments to functions expecting
non-null (in unevaluated contexts)
- Add a few pragmas to turn off spurious warnings
- Fix warnings about declarations that don't declare anything
- Properly disable deprecation warnings in ext/ tests (the pragmas we
were using didn't work on GCC)
- Disable include_as_c.sh.cpp because GCC complains about C++ flags
when compiling as C. I couldn't find a way to fix this one properly,
so I'm disabling the test. This isn't great, but at least we'll be
able to enable warnings in the whole test suite with GCC.

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Add include for 'test_macros.h' to all the tests that were missing them. Thanks to Zoe for the (big, but simple) patch. NFC intended.

llvm-svn: 362252

Support tests in freestanding

Summary:
Freestanding is *weird*. The standard allows it to differ in a bunch of odd
manners from regular C++, and the committee would like to improve that
situation. I

Support tests in freestanding

Summary:
Freestanding is *weird*. The standard allows it to differ in a bunch of odd
manners from regular C++, and the committee would like to improve that
situation. I'd like to make libc++ behave better with what freestanding should
be, so that it can be a tool we use in improving the standard. To do that we
need to try stuff out, both with "freestanding the language mode" and
"freestanding the library subset".

Let's start with the super basic: run the libc++ tests in freestanding, using
clang as the compiler, and see what works. The easiest hack to do this:

In utils/libcxx/test/config.py add:

self.cxx.compile_flags += ['-ffreestanding']

Run the tests and they all fail.

Why? Because in freestanding `main` isn't special. This "not special" property
has two effects: main doesn't get mangled, and main isn't allowed to omit its
`return` statement. The first means main gets mangled and the linker can't
create a valid executable for us to test. The second means we spew out warnings
(ew) and the compiler doesn't insert the `return` we omitted, and main just
falls of the end and does whatever undefined behavior (if you're luck, ud2
leading to non-zero return code).

Let's start my work with the basics. This patch changes all libc++ tests to
declare `main` as `int main(int, char**` so it mangles consistently (enabling us
to declare another `extern "C"` main for freestanding which calls the mangled
one), and adds `return 0;` to all places where it was missing. This touches 6124
files, and I apologize.

The former was done with The Magic Of Sed.

The later was done with a (not quite correct but decent) clang tool:

https://gist.github.com/jfbastien/793819ff360baa845483dde81170feed

This works for most tests, though I did have to adjust a few places when e.g.
the test runs with `-x c`, macros are used for main (such as for the filesystem
tests), etc.

Once this is in we can create a freestanding bot which will prevent further
regressions. After that, we can start the real work of supporting C++
freestanding fairly well in libc++.

<rdar://problem/47754795>

Reviewers: ldionne, mclow.lists, EricWF

Subscribers: christof, jkorous, dexonsmith, arphaman, miyuki, libcxx-commits

Differential Revision: https://reviews.llvm.org/D57624

llvm-svn: 353086

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Update more file headers across all of the LLVM projects in the monorepo
to reflect the new license. These used slightly different spellings that
defeated my regular expressions.

We understand that

Update more file headers across all of the LLVM projects in the monorepo
to reflect the new license. These used slightly different spellings that
defeated my regular expressions.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351648

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Move test into test/std subdirectory.

llvm-svn: 224658