[PATCH] [CodeGen] Add a pass to fold null checks into nearby memory operations.

[Sanjoy Das]

Hi atrick, reames, rnk, pgavlin,

This change adds an "ImplicitNullChecks" target dependent pass.  This
pass folds null checks into memory operation using the FAULTING_LOAD
pseudo-op introduced in previous patches.

Depends on D10197
Depends on D10199
Depends on D10200

http://reviews.llvm.org/D10201

Files:
  include/llvm/CodeGen/Passes.h
  include/llvm/InitializePasses.h
  lib/CodeGen/CMakeLists.txt
  lib/CodeGen/CodeGen.cpp
  lib/CodeGen/ImplicitNullChecks.cpp
  lib/CodeGen/Passes.cpp
  test/CodeGen/X86/implicit-null-check-negative.ll
  test/CodeGen/X86/implicit-null-check.ll

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