Enhance ScanReachableSymbols::scan(). Now another OSAtomic test case passes.
The old test case has a little mistake.

llvm-svn: 93148
diff --git a/clang/lib/Analysis/GRState.cpp b/clang/lib/Analysis/GRState.cpp
index 7415fa5..051d465 100644
--- a/clang/lib/Analysis/GRState.cpp
+++ b/clang/lib/Analysis/GRState.cpp
@@ -267,6 +267,9 @@
   if (loc::MemRegionVal *X = dyn_cast<loc::MemRegionVal>(&val))
     return scan(X->getRegion());
 
+  if (nonloc::LocAsInteger *X = dyn_cast<nonloc::LocAsInteger>(&val))
+    return scan(X->getLoc());
+
   if (SymbolRef Sym = val.getAsSymbol())
     return visitor.VisitSymbol(Sym);