[AVX512] Add initial support for the Execution Domain fixing pass to change some EVEX instructions.

llvm-svn: 276393
diff --git a/llvm/lib/Target/X86/X86TargetMachine.cpp b/llvm/lib/Target/X86/X86TargetMachine.cpp
index 50c9c25..d58882d 100644
--- a/llvm/lib/Target/X86/X86TargetMachine.cpp
+++ b/llvm/lib/Target/X86/X86TargetMachine.cpp
@@ -321,7 +321,7 @@
 
 void X86PassConfig::addPreEmitPass() {
   if (getOptLevel() != CodeGenOpt::None)
-    addPass(createExecutionDependencyFixPass(&X86::VR128RegClass));
+    addPass(createExecutionDependencyFixPass(&X86::VR128XRegClass));
 
   if (UseVZeroUpper)
     addPass(createX86IssueVZeroUpperPass());