PR25501: Delay loading visible updates for a declaration until after we've
processed update records. If an update record adds a definition, we need to
merge that with any pre-existing definition to d

PR25501: Delay loading visible updates for a declaration until after we've
processed update records. If an update record adds a definition, we need to
merge that with any pre-existing definition to determine which the canonical
definition is before we apply the visible update, otherwise we wouldn't know
where to apply it.

Thanks to Vassil Vassilev for help reducing this and tracking down the problem.

llvm-svn: 265848

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