gh-145685: Avoid contention on TYPE_LOCK in super() lookups

[colesbury]

• Issue: Unexpected scaling bottleneck in _PyType_Lookup / _PyType_LookupStackRefAndVersion #145685

[mpage]

LGTM. Should we add a test to the scaling benchmark that reproduces the issue?

[mpage]

Doesn't need to be in this PR, but would it be worth adding another function that combines these two operations?

[colesbury]

Yeah, makes sense.

[colesbury]

This is enough to fix super() on different classes, but not enough for the straightforward super() on the same class. That'll require some additional fixes. I'll add the scaling benchmark in a follow up together with those fixes:

class Base:
    def method(self):
        return 1

class Derived(Base):
    def method(self):
        return super().method()

@register_benchmark
def super_call():
    obj = Derived()
    for _ in range(1000 * WORK_SCALE):
        obj.method()

[colesbury]

Actually, maybe it's worth adding the different class benchmark now and I'll update it later.