[PATCH] D52817: AMDGPU: Only add implicit super-reg def for first subreg

[Matt Arsenault via Phabricator via llvm-commits]

arsenm added a comment.

In https://reviews.llvm.org/D52817#1259935, @ronlieb wrote:

> is this patch worthy of a lit test ?


Not really. This doesn't really change anything, but simplifies a future patch


https://reviews.llvm.org/D52817