Fix DWARF handling of 128bit float registers on SPARC64

[jsonn]

Bugzilla Link	34656
Resolution	FIXED
Resolved on	Sep 29, 2017 16:39
Version	5.0
OS	Linux
Blocks	#33840
CC	@tstellar
Fixed by commit(s)	r311951 r312038 r314567

Extended Description

This is the fix for 34323.

Please merge r311951 and r312038.

[jsonn]

assigned to @adrian-prantl

[tstellar]

Adrian, are these commits OK to merge to the release_50 branch?

https://reviews.llvm.org/rL311951
https://reviews.llvm.org/rL312038

[adrian-prantl]

Yes, these are safe to merge, thanks!

[tstellar]

Merged: r314567