[clang] Reland [Clang][Cmake] fix libtool duplicate member name warnings (PR #133850)

[Farzon Lotfi via cfe-commits]

farzonl wrote:

> I don't really get why that problem is specific to DirectX though. All of these make use of CodeGen, right?


@nikic  I see what you are asking. you want more specific on the error not that the error happened.

because of this:
https://github.com/llvm/llvm-project/blob/42b3f91fd6c850492f6f899d6a0f12ccb948aa1a/clang/lib/CodeGen/Targets/DirectX.cpp#L79-L80

 `clang::CodeGen::HLSLBufferLayoutBuilder::createLayoutType(clang::RecordType const*, llvm::SmallVector<int, 12u> const*)` which is used by DirectXTargetCodeGenInfo::getHLSLType is defined here `clang/lib/CodeGen/HLSLBufferLayoutBuilder.cpp`. 

 I could potentially try to move `HLSLBufferLayoutBuilder` to  Targets directory and see if that fixes things. 

If that works I'll ask @bogner if its ok to move.

https://github.com/llvm/llvm-project/pull/133850