trans move_val_init expression directly into the destination address. #25959
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Hack the move_val_init intrinsic to trans directly into the destination address.
This is to remove an intermediate (and unnecessary) alloca on the stack that one otherwise suffers when using this intrinsic.
This is part of the
box
protocol work; in particular, this is meant to address theptr::write
codegen issues alluded to at this comment:#22086 (comment)
cc #22181