[MC] Use a variant to hold MCCFIInstruction state (NFC) (#164720) #682
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AMDGPU requires more complex CFI rules, normally these would be expressed with .cfi_escape, however this would make the CFI unreadable and makes it difficult to update registers in CFI instructions (also something AMDGPU requires). Authored-by: Emma Pilkington <Emma.Pilkington@amd.com> (cherry picked from commit fd94b41)
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AMDGPU requires more complex CFI rules, normally these would be expressed with .cfi_escape, however this would make the CFI unreadable and makes it difficult to update registers in CFI instructions (also something AMDGPU requires).
Authored-by: Emma Pilkington Emma.Pilkington@amd.com
(cherry picked from commit fd94b41)