fixes: https://github.com/llvm/llvm-project/issues/99108
Implement dst algorithm in the hlsl_intrinsics.h and added test cases
for HLSL codegen and sema
- [x] implement dst algorithm in the hlsl_intrinsics.h
- [x] Add HLSL codegen tests to clang/test/CodeGenHLSL/builtins/dst.hlsl
- [x] Add sema tests to clang/test/SemaHLSL/BuiltIns/dst-errors.hlsl
