[PATCH] Update optimization passes to handle inalloca arguments

[Reid Kleckner]

    - tweak comments and add a test case.

http://llvm-reviews.chandlerc.com/D2449

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2449?vs=6516&id=6563#toc

Files:
  lib/Analysis/MemoryBuiltins.cpp
  lib/Analysis/ValueTracking.cpp
  lib/Transforms/IPO/ArgumentPromotion.cpp
  lib/Transforms/IPO/DeadArgumentElimination.cpp
  lib/Transforms/IPO/FunctionAttrs.cpp
  lib/Transforms/IPO/IPConstantPropagation.cpp
  lib/Transforms/InstCombine/InstCombineCalls.cpp
  lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
  lib/Transforms/ObjCARC/ObjCARC.h
  lib/Transforms/Scalar/DeadStoreElimination.cpp
  test/Transforms/ArgumentPromotion/inalloca-2.ll
  test/Transforms/ArgumentPromotion/inalloca.ll
  test/Transforms/DeadStoreElimination/simple.ll
  test/Transforms/FunctionAttrs/readattrs.ll
  test/Transforms/InstCombine/call-cast-target-inalloca.ll
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