Chuanqi Xu 847f9cb0e8 Reland [C++20] [Modules] [Itanium ABI] Generate the vtable in the mod… (#102287) ...

Reland https://github.com/llvm/llvm-project/pull/75912

The differences of this PR between
https://github.com/llvm/llvm-project/pull/75912 are:

- Fixed a regression in `Decl::isInAnotherModuleUnit()` in DeclBase.cpp
pointed by @mizvekov and add the corresponding test.
- Fixed the regression in windows
https://github.com/llvm/llvm-project/issues/97447. The changes are in
`CodeGenModule::getVTableLinkage` from
`clang/lib/CodeGen/CGVTables.cpp`. According to the feedbacks from MSVC
devs, the linkage of vtables won't affected by modules. So I simply
skipped the case for MSVC.

Given this is more or less fundamental to the use of modules. I hope we
can backport this to 19.x.

2024-08-08 13:14:09 +08:00

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