tree a411acce47e6b60ef87bc2f873604aad1d31c318
parent 15ed726eae70a479f3179de68a643ef30c777cbb
author Aart Bik <ajcbik@google.com> 1442433025 -0700
committer Aart Bik <ajcbik@google.com> 1443050453 -0700

Various improvements in finding induction variables.

Rationale:
(1) Analyze multi-way phis (requested by Nicolas, Igor, and Mingyao).
(2) Analyze trip count for restricted != loops
(3) Added unit test for public API of range analysis (static methods
    were already well-tested).

Change-Id: I9285d22d3bb927f141204cc4697ea6fe5120994d