[lldb] Skip TestPointerToMemberTypeDependingOnParentSize on Windows and GCC

The test added in D100977 is failing to compile on these platforms. This seems
to be caused by GCC, MSVC and Clang@Windows

[lldb] Skip TestPointerToMemberTypeDependingOnParentSize on Windows and GCC

The test added in D100977 is failing to compile on these platforms. This seems
to be caused by GCC, MSVC and Clang@Windows rejecting the code because
`ToLayout` isn't complete when pointer_to_member_member is declared (even though
that seems to be valid code).

This also reverts the test changes in the lazy-loading test from D100977 as
that failed for the same reason.

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[lldb] Use forward type in pointer-to-member

This change is similar in spirit to the change at:
https://reviews.llvm.org/rG34c697c85e9d0af11a72ac4df5578aac94a627b3

It fixes the problem where the la

[lldb] Use forward type in pointer-to-member

This change is similar in spirit to the change at:
https://reviews.llvm.org/rG34c697c85e9d0af11a72ac4df5578aac94a627b3

It fixes the problem where the layout of a type was being accessed
while its base classes were not populated yet; which caused an
incorrect layout to be produced and cached.

This fixes PR50054

Reviewed By: teemperor

Differential Revision: https://reviews.llvm.org/D100977

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[lldb] Don't recursively load types of static member variables in the DWARF AST parser

When LLDB's DWARF parser is parsing the member DIEs of a struct/class it
currently fully resolves the types of

[lldb] Don't recursively load types of static member variables in the DWARF AST parser

When LLDB's DWARF parser is parsing the member DIEs of a struct/class it
currently fully resolves the types of static member variables in a class before
adding the respective `VarDecl` to the record.

For record types fully resolving the type will also parse the member DIEs of the
respective class. The other way of resolving is just 'forward' resolving the type
which will try to load only the minimum amount of information about the type
(for records that would only be the name/kind of the type). Usually we always
resolve types on-demand so it's rarely useful to speculatively fully resolve
them on the first use.

This patch changes makes that we only 'forward' resolve the types of static
members. This solves the fact that LLDB unnecessarily loads debug information
to parse the type if it's maybe not needed later and it also avoids a crash where
the parsed type might in turn reference the surrounding class that is currently
being parsed.

The new test case demonstrates the crash that might happen. The crash happens
with the following steps:

1. We parse class `ToLayout` and it's members.

2. We parse the static class member and fully resolve its type
(`DependsOnParam2<ToLayout>`).

3. That type has a non-static class member `DependsOnParam1<ToLayout>` for which
LLDB will try to calculate the size.

4. The layout (and size)`DependsOnParam1<ToLayout>` turns depends on the
`ToLayout` size/layout.

5. Clang will calculate the record layout/size for `ToLayout` even though we are
currently parsing it and it's missing it's non-static member.

The created is missing the offset for the yet unparsed non-static member. If we
later try to get the offset we end up hitting different asserts. Most common is
the one in `TypeSystemClang::DumpValue` where it checks that the record layout
has offsets for the current FieldDecl.

```
assert(field_idx < record_layout.getFieldCount());
```

Fixed rdar://67910011

Reviewed By: shafik

Differential Revision: https://reviews.llvm.org/D100180

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[lldb][test] Remove symlink for API tests.

Summary: Moves lldbsuite tests to lldb/test/API.

This is a largely mechanical change, moved with the following steps:

```
rm lldb/test/API/testcases
mkdi

[lldb][test] Remove symlink for API tests.

Summary: Moves lldbsuite tests to lldb/test/API.

This is a largely mechanical change, moved with the following steps:

```
rm lldb/test/API/testcases
mkdir -p lldb/test/API/{test_runner/test,tools/lldb-{server,vscode}}
mv lldb/packages/Python/lldbsuite/test/test_runner/test lldb/test/API/test_runner
for d in $(find lldb/packages/Python/lldbsuite/test/* -maxdepth 0 -type d | egrep -v "make|plugins|test_runner|tools"); do mv $d lldb/test/API; done
for d in $(find lldb/packages/Python/lldbsuite/test/tools/lldb-vscode -maxdepth 1 -mindepth 1 | grep -v ".py"); do mv $d lldb/test/API/tools/lldb-vscode; done
for d in $(find lldb/packages/Python/lldbsuite/test/tools/lldb-server -maxdepth 1 -mindepth 1 | egrep -v "gdbremote_testcase.py|lldbgdbserverutils.py|socket_packet_pump.py"); do mv $d lldb/test/API/tools/lldb-server; done
```

lldb/packages/Python/lldbsuite/__init__.py and lldb/test/API/lit.cfg.py were also updated with the new directory structure.

Reviewers: labath, JDevlieghere

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D71151

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