Use explicit constants in stack effects when known.

We use oparg for stack effects even when oparg is a constant for a particular specialization.
For example UNPACK_SEQUENCE_TUPLE is defined as:

inst(UNPACK_SEQUENCE_TWO_TUPLE, (unused/1, seq -- values[oparg]))

resulting in slightly inefficient code. It should be defined as:

inst(UNPACK_SEQUENCE_TWO_TUPLE, (unused/1, seq -- val1, val0))

GH-116468: Use constants instead of `oparg` in stack effects when `op…

Triage: can this issue be closed?

pythonGH-116468: Use constants instead of `oparg` in stack effects wh…

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