Add an ivar to SymbolReaper for the current statement, and then stop passing the current statement around everywhere. Preparation for symbolic extents.

llvm-svn: 107422
diff --git a/clang/lib/Checker/FlatStore.cpp b/clang/lib/Checker/FlatStore.cpp
index 7f1c579..2b6b1ac 100644
--- a/clang/lib/Checker/FlatStore.cpp
+++ b/clang/lib/Checker/FlatStore.cpp
@@ -44,7 +44,7 @@
   }
 
   SVal ArrayToPointer(Loc Array);
-  const GRState *RemoveDeadBindings(GRState &state, Stmt* Loc, 
+  const GRState *RemoveDeadBindings(GRState &state, 
                            const StackFrameContext *LCtx,
                            SymbolReaper& SymReaper,
                          llvm::SmallVectorImpl<const MemRegion*>& RegionRoots){