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* [PhiValues] Adjust unit test to invalidate instructions before deleting themJohn Brawn2018-06-281-1/+1
| | | | | | This should fix a sanitizer buildbot failure. llvm-svn: 335862
* Add a PhiValuesAnalysis pass to calculate the underlying values of phisJohn Brawn2018-06-281-0/+208
This pass is being added in order to make the information available to BasicAA, which can't do caching of this information itself, but possibly this information may be useful for other passes. Incorporates code based on Daniel Berlin's implementation of Tarjan's algorithm. Differential Revision: https://reviews.llvm.org/D47893 llvm-svn: 335857
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