[X86] Adding a testpoint for fast-math flags propagation.

test/CodeGen/X86/fmf-flags.ll

+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=x86_64-unknown | FileCheck %s -check-prefix=X64
+; RUN: llc < %s -mtriple=i686-unknown   | FileCheck %s -check-prefix=X86
+
+declare float @llvm.sqrt.f32(float %x);
+
+define float @fast_recip_sqrt(float %x) {
+; X64-LABEL: fast_recip_sqrt:
+; X64:       # BB#0:
+; X64-NEXT:    sqrtss %xmm0, %xmm1
+; X64-NEXT:    movss {{.*#+}} xmm0 = mem[0],zero,zero,zero
+; X64-NEXT:    divss %xmm1, %xmm0
+; X64-NEXT:    retq
+;
+; X86-LABEL: fast_recip_sqrt:
+; X86:       # BB#0:
+; X86-NEXT:    flds {{[0-9]+}}(%esp)
+; X86-NEXT:    fsqrt
+; X86-NEXT:    fld1
+; X86-NEXT:    fdivp %st(1)
+; X86-NEXT:    retl
+  %y = call fast float @llvm.sqrt.f32(float %x)
+  %z = fdiv fast float 1.0,  %y
+  ret float %z
+}
+
+declare float @llvm.fmuladd.f32(float %a, float %b, float %c);
+
+define float @fast_fmuladd_opts(float %a , float %b , float %c) {
+; X64-LABEL: fast_fmuladd_opts:
+; X64:       # BB#0:
+; X64-NEXT:    movaps %xmm0, %xmm1
+; X64-NEXT:    addss %xmm1, %xmm1
+; X64-NEXT:    addss %xmm0, %xmm1
+; X64-NEXT:    movaps %xmm1, %xmm0
+; X64-NEXT:    retq
+;
+; X86-LABEL: fast_fmuladd_opts:
+; X86:       # BB#0:
+; X86-NEXT:    flds {{[0-9]+}}(%esp)
+; X86-NEXT:    fld %st(0)
+; X86-NEXT:    fadd %st(1)
+; X86-NEXT:    faddp %st(1)
+; X86-NEXT:    retl
+  %res = call fast float @llvm.fmuladd.f32(float %a, float 2.0, float %a)
+  ret float %res
+}