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Shinji Okumura cc1db81009 [Attributor] Add flag for undef value to the state of AAPotentialValues
Currently, an undef value is reduced to 0 when it is added to a set of potential values.
This patch introduces a flag for under values. By this, for example, we can merge two states `{undef}`, `{1}` to `{1}` (because we can reduce the undef to 1).

Reviewed By: jdoerfert

Differential Revision: https://reviews.llvm.org/D85592
2020-08-27 16:30:29 +09:00
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2020-08-26 16:11:11 -07:00