Thomas Lively 2f519825ba [WebAssembly] Add prototype relaxed SIMD fma/fms instructions ...

Add experimental clang builtins, LLVM intrinsics, and backend definitions for
the new {f32x4,f64x2}.{fma,fms} instructions in the relaxed SIMD proposal:
https://github.com/WebAssembly/relaxed-simd/blob/main/proposals/relaxed-simd/Overview.md.
Do not allow these instructions to be selected without explicit user opt-in.

Differential Revision: https://reviews.llvm.org/D110295

2021-09-23 11:01:36 -07:00

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