Partial fix for verification of where pointer conversions can appear. #17972
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The existing verification seems unnecessarily brittle, but this isn't
a general fix for that problem. This fixes one instance of where we
are generating perfectly valid pointer conversions that the verifier
is currently blowing up on.
I've opened https://bugs.swift.org/browse/SR-8264 to track reworking
this verification to not be quite so brittle.