[clang] [Matrix][HLSL] Add codegen support for Matrix Layout keywords (PR #198887)

[Farzon Lotfi via cfe-commits]

farzonl wrote:

test failures are unrelated:
```
Failed Tests (2):
  Clang :: Driver/hip-toolchain-no-rdc.hip
  Clang :: Driver/hipspv-toolchain.hip
```

https://github.com/llvm/llvm-project/pull/198887