Make X86::FsFLD0SS / FsFLD0SD real pseudo-instructions.

Like V_SET0, these instructions are expanded by ExpandPostRA to xorps /
vxorps so they can participate in execution domain swizzling.

This also makes the AVX variants redundant.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145440 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/X86/sse-domains.ll b/test/CodeGen/X86/sse-domains.ll
index 3b66f4f..d1e07c8 100644
--- a/test/CodeGen/X86/sse-domains.ll
+++ b/test/CodeGen/X86/sse-domains.ll
@@ -45,6 +45,7 @@
 }
 
 ; CHECK: f2
+; CHECK: for.body
 ;
 ; This loop contains two cvtsi2ss instructions that update the same xmm
 ; register.  Verify that the execution dependency fix pass breaks those