[mypyc] Fix invalid unlikely() in certain rare branches #11939
Merged
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If we switch true/false branches, we also need to switch between
likely/unlikely.
This has an impact at least on accessing module-level final attributes
with non-constant initializers. I couldn't see a significant
difference in benchmark results compare to master, but this seems to
help together with some other work-in-progress improvements I have
been working on (and the old behavior was clearly wrong).