[silgen] When forwarding a tuple value, make sure that it is at +1. #13891
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[silgen] When forwarding a tuple value, make sure that it is at +1.
In the code, we assume generally that a value that is "forwarded" into memory is
forwarded at +1. This isn't enforced and when I tried to enforce it at +0, I
quickly hit assertion failures. So rather than fix the myriad places, I am using
ensurePlusOne to handle such cases without needing to change a bunch of the
code.
rdar://34222540