John Brawn 106ffb9169 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


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@335857 91177308-0d34-0410-b5e6-96231b3b80d8

2018-06-28 14:13:06 +00:00

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basic.ll

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big_phi.ll

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long_phi_chain.ll

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