Change references to 'const ProgramState *' to typedef 'ProgramStateRef'.

At this point this is largely cosmetic, but it opens the door to replace
ProgramStateRef with a smart pointer that more eagerly acts in the role
of reclaiming unused ProgramState objects.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@149081 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/StaticAnalyzer/Checkers/BuiltinFunctionChecker.cpp b/lib/StaticAnalyzer/Checkers/BuiltinFunctionChecker.cpp
index 50938fa..509bc79 100644
--- a/lib/StaticAnalyzer/Checkers/BuiltinFunctionChecker.cpp
+++ b/lib/StaticAnalyzer/Checkers/BuiltinFunctionChecker.cpp
@@ -31,7 +31,7 @@
 
 bool BuiltinFunctionChecker::evalCall(const CallExpr *CE,
                                       CheckerContext &C) const {
-  const ProgramState *state = C.getState();
+  ProgramStateRef state = C.getState();
   const FunctionDecl *FD = C.getCalleeDecl(CE);
   const LocationContext *LCtx = C.getLocationContext();
   if (!FD)