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[CodeGen][ObjC] Annotate retain-agnostic ObjC globals with attributeā€¦

Authored by ahatanak on Jun 14 2019, 3:06 PM.

Description

[CodeGen][ObjC] Annotate retain-agnostic ObjC globals with attribute 'objc_arc_inert'

The attribute enables the ARC optimizer to delete ObjC ARC runtime calls
on the annotated globals (see https://reviews.llvm.org/D62433). We
currently only annotate global variables for string literals and global
blocks with the attribute.

rdar://problem/49839633

Differential Revision: https://reviews.llvm.org/D62831

llvm-svn: 363467