Correctly construct an ElementRegion for alloca() + pointer arithmetic.  Fixes analyzer
crash reported in PR 7450.

llvm-svn: 106609
diff --git a/clang/lib/Checker/RegionStore.cpp b/clang/lib/Checker/RegionStore.cpp
index 6f8c250..a9d12df 100644
--- a/clang/lib/Checker/RegionStore.cpp
+++ b/clang/lib/Checker/RegionStore.cpp
@@ -883,8 +883,7 @@
     }
     case MemRegion::AllocaRegionKind: {
       const AllocaRegion *AR = cast<AllocaRegion>(MR);
-      QualType T = getContext().CharTy; // Create an ElementRegion of bytes.
-      QualType EleTy = T->getAs<PointerType>()->getPointeeType();
+      QualType EleTy = getContext().CharTy; // Create an ElementRegion of bytes.
       SVal ZeroIdx = ValMgr.makeZeroArrayIndex();
       ER = MRMgr.getElementRegion(EleTy, ZeroIdx, AR, getContext());
       break;