[issue26802] Avoid copy in call_function_var when no extra stack args are passed

[Joe Jevnik]

Joe Jevnik added the comment:

CALL_FUNCTION doesn't use extended arg; I don't see what we get by adding some opcode to convert the sequence into a tuple. We also don't want to box up the stack arguments into a tuple because when we do a CALL_FUNCTION to a python function we just copy the stack[-n:] elements into the locals of the next frame. Emitting a build_tuple here would be an unneeded allocation.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26802>
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