Specialize COMPARE_OP

[sweeneyde]

Some specialization statistics:

https://gist.github.com/sweeneyde/49cc3a9d074d56cf095cb0a42d13d7a4

Including 3 opcodes: COMPARE_OP_INT and COMPARE_OP_FLOAT and COMPARE_OP_STR (equality only) seems to give pretty good specialization numbers.

[sweeneyde]

I opened python/cpython#29734

[gvanrossum]

(To be clear, that PR was merged. Thanks, Dennis!)