[clang] [llvm] [X86][AVX10.2] Support AVX10.2-CONVERT new instructions. (PR #101600)

[Joseph Huber via llvm-commits]

jhuber6 wrote:

```llvm/llvm-project/build/lib/clang/20/include/avx10_2convertintrin.h:29:19: error: use of undeclared identifier '__builtin_ia32_vcvt2ps2phx128_mask'
   29 |   return (__m128h)__builtin_ia32_vcvt2ps2phx128_mask(
      |                   ^
```
I'm getting a lot of errors like this since this patch landed.

https://github.com/llvm/llvm-project/pull/101600