Enhance modularization: return a <state,loc> pair to let GRExprEngine modify the
environment.

llvm-svn: 59407
diff --git a/clang/lib/Analysis/BasicStore.cpp b/clang/lib/Analysis/BasicStore.cpp
index 8b5ef6e..ae6febf 100644
--- a/clang/lib/Analysis/BasicStore.cpp
+++ b/clang/lib/Analysis/BasicStore.cpp
@@ -66,9 +66,9 @@
   ///  conversions between arrays and pointers.
   SVal ArrayToPointer(SVal Array) { return Array; }
 
-  const GRState* CastRegion(const GRState* St, SVal VoidPtr, QualType CastToTy,
-                            Stmt* CastE) {
-    return St;
+  std::pair<const GRState*, SVal> 
+  CastRegion(const GRState* St, SVal VoidPtr, QualType CastToTy, Stmt* CastE) {
+    return std::pair<const GRState*, SVal>(St, UnknownVal());
   }