Add MacOSXAPIChecker, a meta checker to include various precondition checks for calls
to various MacOS X functions.  The checks in BasicObjCFoundationChecks.cpp will
gradually be migrated here.

As a first check, check that when 'dispatch_once()' is passed a predicate value
that has non-local storage.

llvm-svn: 97116
diff --git a/clang/lib/Checker/GRExprEngine.cpp b/clang/lib/Checker/GRExprEngine.cpp
index 3872856..7689a35 100644
--- a/clang/lib/Checker/GRExprEngine.cpp
+++ b/clang/lib/Checker/GRExprEngine.cpp
@@ -319,6 +319,7 @@
   RegisterBuiltinFunctionChecker(Eng);
   RegisterOSAtomicChecker(Eng);
   RegisterUnixAPIChecker(Eng);
+  RegisterMacOSXAPIChecker(Eng);
 }
 
 GRExprEngine::GRExprEngine(AnalysisManager &mgr, GRTransferFuncs *tf)