[X86] EmitX86BuiltinExpr - attempt to convert SSE41/AVX1 roundps/d/ss/sd builtins to regular rounding modes (#171227) Adding clauses to `CodeGenFunction::EmitX86BuiltinExpr` to convert SSE4.1/AVX1 builts `roundps/pd/ss/sd` to regular rounding modes. We use: 1. `roundeven/floor/ceil/trunc` when not using MXCSR or _MM_FROUND_RAISE_EXC , and FP mode is not strict, 2. `experimental_constrained_roundeven/floor/ceil/trunc` when not using MXCSR or _MM_FROUND_RAISE_EXC , and FP mode is strict 3. `x86_sse41/avx_round_ps/pd/ss/sd` when using MXCSR or _MM_FROUND_RAISE_EXC . Closes #170273
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