[clang] [llvm] Reland "[HLSL] Implement the reflect HLSL function" (PR #125599)

[Deric Cheung via cfe-commits]

Icohedron wrote:

@vitalybuka Could you get more details as to why the original PR failed in the hwasan-check from the `sanitizer-aarch64-linux-bootstrap-hwasan` buildbot? The buildbot's report is linked here: [https://lab.llvm.org/buildbot/#/builders/55/builds/5962](https://lab.llvm.org/buildbot/#/builders/55/builds/5962)


https://github.com/llvm/llvm-project/pull/125599