MemRegion can refer to ASTContext without external help.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@110784 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Checker/Store.cpp b/lib/Checker/Store.cpp
index 7a43f7b..e0e2c3a 100644
--- a/lib/Checker/Store.cpp
+++ b/lib/Checker/Store.cpp
@@ -83,7 +83,7 @@
   // Handle casts from compatible types.
   if (R->isBoundable())
     if (const TypedRegion *TR = dyn_cast<TypedRegion>(R)) {
-      QualType ObjTy = Ctx.getCanonicalType(TR->getValueType(Ctx));
+      QualType ObjTy = Ctx.getCanonicalType(TR->getValueType());
       if (CanonPointeeTy == ObjTy)
         return R;
     }
@@ -159,7 +159,7 @@
         // check to see if type we are casting to is the same as the base
         // region.  If so, just return the base region.
         if (const TypedRegion *TR = dyn_cast<TypedRegion>(baseR)) {
-          QualType ObjTy = Ctx.getCanonicalType(TR->getValueType(Ctx));
+          QualType ObjTy = Ctx.getCanonicalType(TR->getValueType());
           QualType CanonPointeeTy = Ctx.getCanonicalType(PointeeTy);
           if (CanonPointeeTy == ObjTy)
             return baseR;
@@ -222,7 +222,7 @@
 
   if (performTestOnly) {  
     // Automatically translate references to pointers.
-    QualType T = R->getValueType(Ctx);
+    QualType T = R->getValueType();
     if (const ReferenceType *RT = T->getAs<ReferenceType>())
       T = Ctx.getPointerType(RT->getPointeeType());