[PATCH] llvm.noalias - CaptureTracking needs to look through them

[hfinkel at anl.gov]

Hi chandlerc, reames,

This is part of the series started by D9375, and teaches CaptureTracking to look through calls to llvm.noalias.

P.S. One reason why llvm.noalias is not itself marked with nocapture is because it requires this special handling anyway.

http://reviews.llvm.org/D9386

Files:
  lib/Analysis/CaptureTracking.cpp
  test/Transforms/FunctionAttrs/nocapture.ll

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