Merge r315086 to 5.0.1

[compnerd]

Bugzilla Link	34867
Resolution	FIXED
Resolved on	Nov 22, 2017 09:49
Version	trunk
OS	All
Blocks	#33840
CC	@tstellar
Fixed by commit(s)	r315086 r318851

[compnerd]

assigned to @pcc

[compnerd]

This fixes compatibility with binaries built with the newer compiler and older LTO plugin with ObjC code where categories would be dropped.

[tstellar]

Hi Peter,

Is this OK to merge?

https://reviews.llvm.org/rL315086

[pcc]

Approved.

[tstellar]

Merged: r318851