Suggest objc_method_family(none) for a property named -newFoo or similar.

As mentioned in the previous commit, if a property (declared with @property)
has a name that matches a special Objective-C method family, the getter picks
up that family despite being declared by the property. The most correct way
to solve this problem is to add the 'objc_method_family' attribute to the
getter with an argument of 'none', which unfortunately requires an explicit
declaration of the getter.

This commit adds a note to the existing error (ARC) or warning (MRR) for
such a poorly-named property that suggests the solution; if there's already
a declaration of the getter, it even includes a fix-it.

llvm-svn: 226339

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