Fix crash when querying the CFG reported when using the thread safety analysis
on code using multi-dimensional arrays.  Fix by DeLesley Hutchins, and reported in
PR 12271.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@153067 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/CFG.cpp b/lib/Analysis/CFG.cpp
index 0a844a0..24ca958 100644
--- a/lib/Analysis/CFG.cpp
+++ b/lib/Analysis/CFG.cpp
@@ -3087,7 +3087,7 @@
       const VarDecl *var = cast<CFGAutomaticObjDtor>(this)->getVarDecl();
       QualType ty = var->getType();
       ty = ty.getNonReferenceType();
-      if (const ArrayType *arrayType = astContext.getAsArrayType(ty)) {
+      while (const ArrayType *arrayType = astContext.getAsArrayType(ty)) {
         ty = arrayType->getElementType();
       }
       const RecordType *recordType = ty->getAs<RecordType>();