[PATCH] D22375: AMDPU: Use noregister for unset exports

[Matt Arsenault via llvm-commits]

arsenm added a comment.

In https://reviews.llvm.org/D22375#485595, @tstellarAMD wrote:

> What encoding is used for NoRegister?


0, which is the same as vgpr0 for export so nothing changes there


https://reviews.llvm.org/D22375