Introduce preliminary support for NSString format-string checking.
Patch by Nikita Zhuk!


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@52336 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/Sema.cpp b/lib/Sema/Sema.cpp
index 3861d04..78cc5d8 100644
--- a/lib/Sema/Sema.cpp
+++ b/lib/Sema/Sema.cpp
@@ -85,6 +85,7 @@
   KnownFunctionIDs[id_sprintf]   = &IT.get("sprintf");
   KnownFunctionIDs[id_snprintf]  = &IT.get("snprintf");
   KnownFunctionIDs[id_asprintf]  = &IT.get("asprintf");
+  KnownFunctionIDs[id_NSLog]     = &IT.get("NSLog");
   KnownFunctionIDs[id_vsnprintf] = &IT.get("vsnprintf");
   KnownFunctionIDs[id_vasprintf] = &IT.get("vasprintf");
   KnownFunctionIDs[id_vfprintf]  = &IT.get("vfprintf");