[PATCH] [InstCombine] Propagate non-null facts to call parameters

[Philip Reames]

Hi chandlerc, nlewycky,

If a parameter to a function is known non-null, use the existing parameter attributes to record that fact at the call site.  This has no optimization benefit by itself - that I know of - but is an enabling change for http://reviews.llvm.org/D9129.

http://reviews.llvm.org/D9132

Files:
  include/llvm/IR/CallSite.h
  lib/Transforms/InstCombine/InstCombineCalls.cpp
  test/CodeGen/NVPTX/intrin-nocapture.ll
  test/Transforms/Inline/byval-tail-call.ll
  test/Transforms/InstCombine/nonnull-param.ll
  test/Transforms/InstCombine/select.ll

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