[clang] [HLSL] Fix intrinsics header file for wave intrinsics using u/int16_t types, updating them to 6.2 (PR #186218)

[Deric C. via cfe-commits]

Icohedron wrote:

Do we want the TableGen to be using these new `_HLSL_AVAILABILITY_6_2` and `_HLSL_16BIT_AVAILABILITY_DEFAULT` macros as well?

https://github.com/llvm/llvm-project/pull/186218