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Convert some ObjC retain/release msgSends to runtime calls.

Authored by pete on Dec 21 2018, 1:00 PM.

Description

Convert some ObjC retain/release msgSends to runtime calls.

It is faster to directly call the ObjC runtime for methods such as retain/release instead of sending a message to those functions.

Differential Revision: https://reviews.llvm.org/D55869

Reviewed By: rjmccall

llvm-svn: 349952