[PATCH] [ValueTracking] do not overwrite analysis results already computed

[Jingyue Wu]

Hi hfinkel,

ValueTracking used to overwrite the analysis results computed from
assumes and dominating conditions. This patch fixes this issue.

http://reviews.llvm.org/D10283

Files:
  lib/Analysis/ValueTracking.cpp
  test/Analysis/ValueTracking/assume.ll

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