swift

7574c1fe - Fix AccessUtils Value.referenceRoot to handle ForwardingInstructions.

Fix AccessUtils Value.referenceRoot to handle ForwardingInstructions. This fixes all analyses that use AccessUtils in the presence of new forwarding instructions. This is also needed for consistency with the C++ source base. And for general sanity. Utilities that walk the use-def chain should never hard-code a list of opcodes that happened to work with some specific pass. Passes should never assume that a basic SIL utility handles specific SIL operations a certain way. Instead, the utility needs to be defined in terms of SIL semantics. In this case, the utility is supposed to handle all instructions that semantically forward ownership of a reference.