[x86] enable bitcasted fabs/fneg transforms

The vector cases don't change because we already have folds in X86ISelLowering
to look through and remove bitcasts.

llvm-svn: 272427
diff --git a/llvm/test/CodeGen/X86/fp-logic.ll b/llvm/test/CodeGen/X86/fp-logic.ll
index b5f1349..9ab6751 100644
--- a/llvm/test/CodeGen/X86/fp-logic.ll
+++ b/llvm/test/CodeGen/X86/fp-logic.ll
@@ -265,8 +265,7 @@
 define double @bitcast_fabs(double %x) {
 ; CHECK-LABEL: bitcast_fabs:
 ; CHECK:       # BB#0:
-; CHECK-NEXT:    movsd {{.*#+}} xmm1 = mem[0],zero
-; CHECK-NEXT:    andpd %xmm1, %xmm0
+; CHECK-NEXT:    andpd {{.*}}(%rip), %xmm0
 ; CHECK-NEXT:    retq
 ;
   %bc1 = bitcast double %x to i64
@@ -278,8 +277,7 @@
 define float @bitcast_fneg(float %x) {
 ; CHECK-LABEL: bitcast_fneg:
 ; CHECK:       # BB#0:
-; CHECK-NEXT:    movss {{.*#+}} xmm1 = mem[0],zero,zero,zero
-; CHECK-NEXT:    xorps %xmm1, %xmm0
+; CHECK-NEXT:    xorps {{.*}}(%rip), %xmm0
 ; CHECK-NEXT:    retq
 ;
   %bc1 = bitcast float %x to i32