[MoveOnlyChecker] Don't complete phis.
Apply the MoveOnlyAddressChecker change from
https://github.com/swiftlang/swift/pull/73358 to the
MoveOnly[Value]Checker.
After 7713eef8174216bb170461e7b7ba8a1f9574109a, before running value
checking, all lifetimes in the function are completed.  That doesn't
quite work because lifetime completion expects not to encounter
reborrows or their adjacent phis.
rdar://151325025