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[Sema] Formatting warnings should see through Objective-C message sends

Authored by arphaman on Oct 24 2016, 2:42 AM.

Description

[Sema] Formatting warnings should see through Objective-C message sends

This commit improves the '-Wformat' warnings by ensuring that the formatting
checker can see through Objective-C message sends when we are calling an
Objective-C method with an appropriate format_arg attribute.

rdar://23622446

Differential Revision: https://reviews.llvm.org/D25820

llvm-svn: 284961