Convert some uses of XXXRegisterClass to &XXXRegClass. No functional change since they are equivalent.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155186 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86VZeroUpper.cpp b/lib/Target/X86/X86VZeroUpper.cpp
index 2fd78a7..65271db 100644
--- a/lib/Target/X86/X86VZeroUpper.cpp
+++ b/lib/Target/X86/X86VZeroUpper.cpp
@@ -145,7 +145,7 @@
   // to insert any VZEROUPPER instructions.  This is constant-time, so it is
   // cheap in the common case of no ymm use.
   bool YMMUsed = false;
-  const TargetRegisterClass *RC = X86::VR256RegisterClass;
+  const TargetRegisterClass *RC = &X86::VR256RegClass;
   for (TargetRegisterClass::iterator i = RC->begin(), e = RC->end();
        i != e; i++) {
     if (MRI.isPhysRegUsed(*i)) {