[perl #41825] [BUG] morph vtable override not working in PIR

[Allison Randal]

Patrick R. Michaud wrote:
> 
> Just for the record, AFAICT none of PGE/PCT/Rakudo make use of 
> morph any longer.  We now have the 'copy' opcode to do what the
> "morph workaround" was doing (and I don't think copy is using
> VTABLE_morph).

We've been ripping out morph in all the core PMCs too. So, I'm 
comfortable transitioning to just a PMC argument to morph.

Allison