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/BugReporterVisitors.cpp b/lib/Checker/BugReporterVisitors.cpp
index 0323fe6..a6ad245 100644
--- a/lib/Checker/BugReporterVisitors.cpp
+++ b/lib/Checker/BugReporterVisitors.cpp
@@ -143,10 +143,9 @@
 
         if (isa<loc::ConcreteInt>(V)) {
           bool b = false;
-          ASTContext &C = BRC.getASTContext();
           if (R->isBoundable()) {
             if (const TypedRegion *TR = dyn_cast<TypedRegion>(R)) {
-              if (TR->getValueType(C)->isObjCObjectPointerType()) {
+              if (TR->getValueType()->isObjCObjectPointerType()) {
                 os << "initialized to nil";
                 b = true;
               }
@@ -174,10 +173,9 @@
     if (os.str().empty()) {
       if (isa<loc::ConcreteInt>(V)) {
         bool b = false;
-        ASTContext &C = BRC.getASTContext();
         if (R->isBoundable()) {
           if (const TypedRegion *TR = dyn_cast<TypedRegion>(R)) {
-            if (TR->getValueType(C)->isObjCObjectPointerType()) {
+            if (TR->getValueType()->isObjCObjectPointerType()) {
               os << "nil object reference stored to ";
               b = true;
             }