Use utility method to create 0-index into ElementRegion.

llvm-svn: 75865
diff --git a/clang/lib/Analysis/RegionStore.cpp b/clang/lib/Analysis/RegionStore.cpp
index fa355f5..af731c7 100644
--- a/clang/lib/Analysis/RegionStore.cpp
+++ b/clang/lib/Analysis/RegionStore.cpp
@@ -672,8 +672,8 @@
   ArrayType *AT = cast<ArrayType>(T);
   T = AT->getElementType();
   
-  nonloc::ConcreteInt Idx(getBasicVals().getZeroWithPtrWidth(false));
-  ElementRegion* ER = MRMgr.getElementRegion(T, Idx, ArrayR, getContext());
+  SVal ZeroIdx = ValMgr.makeZeroArrayIndex();
+  ElementRegion* ER = MRMgr.getElementRegion(T, ZeroIdx, ArrayR, getContext());
   
   return loc::MemRegionVal(ER);                    
 }