fix refassign in non-void context #22938
Merged
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GH #22710
The experimental refassign feature, @A = $aref, which allows an array/hash etc to be aliased rather than copied, got broken in rvalue non-void context by v5.39.5-56-g604c0355d2. So in something like
the stack was underflowing. This is because previously pp_refassign() would leave its RH argument on the stack when returning, while my commit above made it always pop the argument off the stack.
This commit makes it only pop the arg in void context.