[PATCH] Infer known bits from dominating conditions

[Philip Reames]

Look at all uses of the comparison as requested by Hal.

On the sqlite3 example I used before, the difference between the two configurations is indistinguishable.  I can quantify on a quieter box later, but on my local machine I don't see much difference.


http://reviews.llvm.org/D7708

Files:
  lib/Analysis/ValueTracking.cpp
  test/Transforms/InstCombine/dom-conditions.ll

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