[issue41670] ceval traces code differently with USE_COMPUTED_GOTOS

[Mark Shannon]

Mark Shannon <mark at hotpy.org> added the comment:

A couple of things to fix here.

Firstly, the PREDICTion of POP_BLOCK in FOR_ITER shouldn't be there. POP_BLOCK doesn't normally occur after a loop and hasn't since we removed "pseudo exceptions" from the interpreter a couple of years ago.

Secondly, there is the issue of PREDICTs skipping tracing.
Either we can make sure that no PREDICTs cross a line boundary, which seems error prone, or we add the check for tracing into the PREDICT macro, which seems more robust.

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<https://bugs.python.org/issue41670>
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