Have scoped mutexes take referenes instead of pointers.

llvm-svn: 74931
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index c8f4b52..5f45c98 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -5010,7 +5010,7 @@
 /// getValueTypeList - Return a pointer to the specified value type.
 ///
 const MVT *SDNode::getValueTypeList(MVT VT) {
-  sys::SmartScopedLock<true> Lock(&*VTMutex);
+  sys::SmartScopedLock<true> Lock(*VTMutex);
   if (VT.isExtended()) {
     return &(*EVTs->insert(VT).first);
   } else {