[msan] Handle x86.avx512fp16.{add,sub.mul,div,min,max}.ph.512 (#136619)
These are handled similarly to x86_avx512_(min|max)_p[sd]_512 intrinsics
(https://github.com/llvm/llvm-project/pull/124421) i.e., using
maybeHandleSimpleNomemIntrinsic, with the last parameter being the
rounding method.
Updates the test from https://github.com/llvm/llvm-project/pull/136260