gh-126612: Include stack effects of uops when computing maximum stack depth

[mpage]

UOPs may want to pass values on the stack. This is currently only guaranteed to be possible if the net stack effect of the instruction is greater than the number of values that need to be passed.

To ensure there is sufficient space on the stack for values passed between uops, we:

1. Compute the set of stack effects for each instruction by computing the stack effect after each uop in the instruction.
2. Collect the set of stack effects for all instructions in a family.
3. Generate a function that computes the maximum stack effect for each instruction. The maximum stack effect for a generic instruction is the maximum of all instructions in the family.
4. Use the maximum stack effect when computing the maximum stack depth of a function.

• Issue: Reserve stack space for passing values between uops #126612

[mpage]

@markshannon - This is the generic solution for passing values between uops (rather than always reserving extra space on the stack) we chatted about at the last faster-cpython sync.