RFR(M): 8213528: fp registers should not need to be saved around a CallLeafNoFP

[Roman Kennke]

>> The we don't need CallLeafNoFPNode, IdealKit::make_leaf_call_no_fp() and NO_FP value. Nobody use it 
>> after your change. Or I am missing something?
> 
> Indeed there's no more use of IdealKit::make_leaf_call_no_fp() and NO_FP
> after my change. I left both there because I suppose some existing calls
> to CallLeaf could be turned into the "new" CallLeafNoFP and so this code
> might be needed in the future but I can remove it if you like.

I supposed we'd use it from Shenandoah, right?

Roman


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