[clang] [libclc] Clang: Deprecate float support from __builtin_elementwise_max (PR #180885)

[Phoebe Wang via cfe-commits]

phoebewang wrote:

I seldom pay attention to generic intrinsic changes, but I'm not surprise to the change. After #172012, the community consensus is to decouple `nsz` flag from generic intrinsics. The assumption is Clang front end should always emit `nsz` to match the C semantics, so that x86 is exempted suffering performance lose. But I'm not front end expert and not pay attention  to the progress.

https://github.com/llvm/llvm-project/pull/180885