[PATCH] Add support for a few Objective-C matchers.

[Dean F. Sutherland]

Changes to lib/Sema/SemaExprObjC.cpp and test/SemaObjC/objc-literal-nsnumber.m are unintentional, and shouldn't be part of this patch!  I'll rebase (again) and fix that.


================
Comment at: include/clang/ASTMatchers/ASTMatchers.h:2075
@@ +2074,3 @@
+
+/// \brief Matches when the selector is the empty selector
+///
----------------
I was unable to tweak this matcher from source code, so no example at the moment. Does this represent an error condition? Should I leave it as a matcher, or just remove it? Guidance eagerly accepted.

http://reviews.llvm.org/D7710

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