[ownership] Refactor checked conversion from ArrayRef<SILInstruction *> -> ArrayRef<BranchPropagatedUser> onto BranchPropagatedUser. #29519
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A branch propagated user that isn't a cond_br is layout compatible with a
SILInstruction *. This helper function converts from ArrayRef<SILInstruction *>
-> ArrayRef but also in asserts builds checks that our
invariant (namely all of the 'SILInstruction *' are not cond_br.