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.

llvm-svn: 149081
diff --git a/clang/lib/StaticAnalyzer/Checkers/ObjCAtSyncChecker.cpp b/clang/lib/StaticAnalyzer/Checkers/ObjCAtSyncChecker.cpp
index 06b138e..f016ec3 100644
--- a/clang/lib/StaticAnalyzer/Checkers/ObjCAtSyncChecker.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/ObjCAtSyncChecker.cpp
@@ -38,7 +38,7 @@
                                      CheckerContext &C) const {
 
   const Expr *Ex = S->getSynchExpr();
-  const ProgramState *state = C.getState();
+  ProgramStateRef state = C.getState();
   SVal V = state->getSVal(Ex, C.getLocationContext());
 
   // Uninitialized value used for the mutex?
@@ -59,7 +59,7 @@
     return;
 
   // Check for null mutexes.
-  const ProgramState *notNullState, *nullState;
+  ProgramStateRef notNullState, nullState;
   llvm::tie(notNullState, nullState) = state->assume(cast<DefinedSVal>(V));
 
   if (nullState) {