[llvm] [1/2][AMDGPU] Fixed crash due to virtual register defs not dominating uses (PR #198472)

[Brendon Cahoon via llvm-commits]

bcahoon wrote:

> This first PR is essentially a cherry-pick of a commit that has been in the AMD-fork for a few months now and working correctly. Additional tests based on the issue #196671 have been added to this first PR. This PR will unblock this issue which otherwise produces a compiler crash. If it looks ok, can we get this first PR approved while we figure out the final solution for the IMPLICIT_DEF in #200126?

This sounds like a good idea as the compiler crash is blocking others. Any objections?


https://github.com/llvm/llvm-project/pull/198472