[cfe-dev] Patch to check unimplemented method declared in objc class extensions

[Jean-Daniel Dupas]

This patch uses the new ObjCImplDecl class to merge   
Sema::ImplMethodsVsClassMethods and  
Sema::ImplCategoryMethodsVsIntfMethods methods.
And now, when clang check a class implementation to find unimplemented  
methods, it also checks all methods from the class extensions (unnamed  
categories).

There is also a test case to check this warning.

This patch contains also a minor update for ObjCImplDecl .  
getNameAsCString and getNameAsString now returns an empty string  
instead of crashing for unnamed categories.

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