[clang] Add _MM_FROUND_TO_NEAREST_TIES_EVEN to avx512fintrin.h (PR #99691)

[Craig Topper via cfe-commits]

topperc wrote:

I happened to find this document from Intel https://www.intel.com/content/www/us/en/content-details/669773/intel-avx-512-fp16-instruction-set-for-intel-xeon-processor-based-products-technology-guide.html that contains this text

"The C intrinsic constant selector name _MM_FROUND_TO_NEAREST_INT is not ideal, but that name has been historically used for so long in all common compilers that it is difficult to change to something more meaningful."

https://github.com/llvm/llvm-project/pull/99691