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Author SHA1 Message Date
John Brawn aa8a88af05 [PhiValues] Adjust unit test to invalidate instructions before deleting them 
This should fix a sanitizer buildbot failure.

llvm-svn: 335862
 2018-06-28 15:17:07 +00:00
John Brawn bdbbd8381f Add a PhiValuesAnalysis pass to calculate the underlying values of phis 
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
 2018-06-28 14:13:06 +00:00