[PATCH] D96980: [amdgpu] Revert agnostic SGPR spill.

[Michael Liao via Phabricator via llvm-commits]

hliao added a comment.

In addition, we already heavily use `v_readfirstlane` in our codegen due to some patterns benefits by using vector instructions when no corresponding scalar instructions could be used. I believed it's quite safe that it's guaranteed `v_readfirstlane` won't be executed when exec mask goes to 0.


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https://reviews.llvm.org/D96980