GH-98831: Support cache effects in super- and macro instructions by gvanrossum · Pull Request #99601 · python/cpython

This once again refactors a lot of the code generator.
There are still cleanups to be done, and I'd like things to be
more compact, but I think most of the refactoring is now done.

sup: SuperInstruction
mac: MacroInstruction
super: Super
macro: Macro

I tried to split it into InstDef and OpDef, removing kind,
but that caused problems because the Instruction class
inherits from InstHeader.