[clang] [llvm] [X86] EmitX86BuiltinExpr - attempt to convert SSE41/AVX1 roundps/d/ss/sd builtins to regular rounding modes (PR #171227)

[Simon Pilgrim via llvm-commits]

https://github.com/RKSimon requested changes to this pull request.

Constrained test coverage can be added to avx-builtins-constrainted.c - you will also need to add a similar sse41-builtins-constrained.c for SSE41 codegen tests

https://github.com/llvm/llvm-project/pull/171227