[clang] [Clang][X86] Introduce Clang ABI Gate for MSVC alignment (PR #210305)

[Evgenii Kudriashov via cfe-commits]

e-kud wrote:

> # 🐧 Linux x64 Test Results
> * 90488 tests passed
> * 1704 tests skipped
> * 1 test failed
> 
> ## Failed Tests
> (click on a test name to see its output)
> 
> ### lldb-api
> lldb-api.python_api/run_locker/TestRunLocker.py

It is flaky reported here: https://github.com/llvm/llvm-project/issues/193787. Rerunning.



https://github.com/llvm/llvm-project/pull/210305