llvm-project

4adce336 - [win][arm64ec] Fixes to unblock building LLVM and Clang as Arm64EC (#150068)

[win][arm64ec] Fixes to unblock building LLVM and Clang as Arm64EC (#150068) These changes allow LLVM and Clang to be built with Clang targeting Arm64EC using the MSVC linker. Built with these options: ``` -DLLVM_ENABLE_PROJECTS="clang" -DLLVM_HOST_TRIPLE=arm64ec-pc-windows-msvc -DCMAKE_C_COMPILER=clang-cl.exe -DCMAKE_C_COMPILER_TARGET=arm64ec-pc-windows-msvc -DCMAKE_CXX_COMPILER=clang-cl.exe -DCMAKE_CXX_COMPILER_TARGET=arm64ec-pc-windows-msvc -DCMAKE_LINKER_TYPE=MSVC ```