regalloc: ensure we only freeze/unfreeze at the outermost scope
This prevents a nasty type of bugs where we accidentally unfreeze
a register that was frozen purposely in the outer scope, risking
accidental realloc of a taken register.
Fix CF flags spilling on aarch64 backend.
ac954eb539Jakub Konka committed on 5/6/2022, 10:57:55 PMparentac1aaec