Nikita Popov 6713332fdd [LoopVersioningLICM] Fix noalias metadata emission ...

The previous code added the scope on each iteration, so that the
same scope was represented many times in the same !noalias metadata.
That's legal, and semantically equivalent to only storing the scope
once, but it's also wasteful and may pessimize further optimization
if AATags get intersected naively, as done by the AliasSetTracker.

2020-10-13 18:58:05 +02:00

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