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[AST] Add a method to get a call type from an ObjCMessageExpr

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[AST] Add a method to get a call type from an ObjCMessageExpr

Due to references, expression type does not always correspond to an
expected method return type (e.g. for a method returning int & the
expression type of the call would still be int).
We have a helper method for getting the expected type on CallExpr, but
not on ObjCMessageExpr.

Differential Revision: https://reviews.llvm.org/D57204

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