[PATCH] D30316: AMDGPU: Make 0 the private nullptr value

[Matt Arsenault via Phabricator via cfe-commits]

arsenm added a comment.

In https://reviews.llvm.org/D30316#686089, @yaxunl wrote:

> LGTM. Thanks! I assume you will make corresponding changes in backend.


This is to match r295891, so then https://reviews.llvm.org/D28937 is required to fix addrspacecast


https://reviews.llvm.org/D30316