[llvm] [AMDGPU] Extend zero initialization of return values for TFE (PR #85759)

[Jay Foad via llvm-commits]

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@@ -1,6 +1,7 @@
 ; NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
 ; RUN: llc -global-isel -mtriple=amdgcn-mesa-mesa3d -mcpu=fiji -stop-after=instruction-select -verify-machineinstrs -o - %s | FileCheck -check-prefix=GFX8 %s
 ; RUN: llc -global-isel -mtriple=amdgcn-mesa-mesa3d -mcpu=gfx1200 -stop-after=instruction-select -verify-machineinstrs -o - %s | FileCheck -check-prefix=GFX12 %s
+; Note that TFE instructions don't have the result initialization to zero due to stopping before finalize-isel - which is where that's inserted
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jayfoad wrote:

Maybe change it to stop-after=finalize-isel?

https://github.com/llvm/llvm-project/pull/85759