llvm dev - Dec 2019 - [FPEnv] Do we need constrained/strict versions of these intrinsics?

I was thinking about a few less common floating point things and wondered
if we need constrained/strict versions of them.

-int_fmuladd - which is used by clang to support fp-contract=on where only
operations within a statement sare allowed to be concentrated.

-int_convert_to_fp16/int_convert_from_fp16 - Used by some targets to
support ieee 16-bit floats as a storage only type I think. A FIXME in clang
indicates the plan was to get rid of these all together, but I'm not sure
where we are on that.

-Not an intrinsic, but we also have ISD::FP16_TO_FP and ISD::FP_TO_FP16 in
SelectionDAG. I believe these are created during type legalization if half
needs to be promoted.

~Craig
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