[mypyc] Implement lowering for remaining tagged integer comparisons #17040
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Support lowering of tagged integer
<,<=,>and>=operations.Previously we had separate code paths for integer comparisons in values vs conditions. Unify these and remove the duplicate code path. The different code paths produced subtly different code, but now they are identical.
The generated code is now sometimes slightly more verbose in the slow path (big integer). I may look into simplifying it in a follow-up PR.
This also makes the output of many irbuild test cases significantly more compact.
Follow-up to #17027. Work on mypyc/mypyc#854.