[clang][Interp] Do r-to-l conversion immediately when returning (#80662)

First, we need to register local constant variables in C, so we get the
same diagnostic behavior as the current interpeter.

[clang][Interp] Do r-to-l conversion immediately when returning (#80662)

First, we need to register local constant variables in C, so we get the
same diagnostic behavior as the current interpeter.

Second, when returning an LValue (as a Pointer), which we eventually
convert to an RValue, we need to do the conversion immediately when
saving the Pointer in the EvaluationResult. Otherwise, we will possibly
deallocate the data before doing the conversion (which will look at the
Block*).

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Remove warnings from -Wchar-subscripts for known positive constants (#69061)

Fixes #18763

Remove warnings when using a signed char as an array bound if the char is a known positive constant.

T

Remove warnings from -Wchar-subscripts for known positive constants (#69061)

Fixes #18763

Remove warnings when using a signed char as an array bound if the char is a known positive constant.

This goes one step farther than gcc does.

For example given the following code
```c++
char upper[300];

int main() {
upper['a'] = 'A';
char b = 'a';
upper[b] = 'A';
const char c = 'a';
upper[c] = 'A';
constexpr char d = 'a';
upper[d] = 'A';
char e = -1;
upper[e] = 'A';
const char f = -1;
upper[f] = 'A';
constexpr char g = -1;
upper[g] = 'A';
return 1;
}
```

clang currently gives warnings for all cases, while gcc gives warnings
for all cases except for 'a' (https://godbolt.org/z/5ahjETTv3)

With the change there is no longer any warning for 'a', 'c', or 'd'.

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Use functions with prototypes when appropriate; NFC

A significant number of our tests in C accidentally use functions
without prototypes. This patch converts the function signatures to have
a protot

Use functions with prototypes when appropriate; NFC

A significant number of our tests in C accidentally use functions
without prototypes. This patch converts the function signatures to have
a prototype for the situations where the test is not specific to K&R C
declarations. e.g.,

void func();

becomes

void func(void);

This is the third batch of tests being updated (there are a significant
number of other tests left to be updated).

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Update tests to use %clang_cc1 instead of 'clang-cc' or 'clang -cc1'.
- This is designed to make it obvious that %clang_cc1 is a "test variable"
which is substituted. It is '%clang_cc1' instead o

Update tests to use %clang_cc1 instead of 'clang-cc' or 'clang -cc1'.
- This is designed to make it obvious that %clang_cc1 is a "test variable"
which is substituted. It is '%clang_cc1' instead of '%clang -cc1' because it
can be useful to redefine what gets run as 'clang -cc1' (for example, to set
a default target).

llvm-svn: 91446

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-Wchar-subscripts should not warn for explicit signed char subscripts either. Another fix for PR4978.

llvm-svn: 81780

-Wchar-subscripts should not warn for unsigned char subscripts. Fixes PR4978.

llvm-svn: 81776

Add support for -Wchar-subscripts. Fixes PR4801.

llvm-svn: 81747