Is saving the stack pointer around method handle calls still needed?

[Krystal Mok]

Hi compiler team,

I'd like to ask if it's still necessary to save the stack pointer around
method handle calls (invokedynamic/invokehandle). It seems like an artifact
left from the Ricochet frame implementation which could mess up the stack
pointer, where as the new LambdaForms implementation shouldn't have that
problem.

Could anyone share the history bit about this?

Best regards,
Kris
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