Juneyoung Lee 0a6aee5160 [ValueTracking] Add canCreateUndefOrPoison & let canCreatePoison use Operator ...

This patch
- adds `canCreateUndefOrPoison`
- refactors `canCreatePoison` so it can deal with constantexprs

`canCreateUndefOrPoison` will be used at D83926.

Reviewed By: nikic, jdoerfert

Differential Revision: https://reviews.llvm.org/D84007

2020-07-20 01:24:30 +09:00

13 KiB

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