[embedded] Consider move_value/copy_value as removable for keypath optimization #73184
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Embedded Swift allows keypaths as long as they don't require any runtime instances to exist. This PR improves on when those are allowed, namely in @dynamicMemberLookup use of setters, where we end up having
move_value
orcopy_value
instructions on the keypath values in SIL. Let's consider those (move_value
andcopy_value
instructions) to be removable by the keypath simplification algorithm.rdar://126655571