[PATCH] D11286: [ImplicitNullChecks] Work with implicit defs.

[Sanjoy Das]

sanjoy created this revision.
sanjoy added reviewers: reames, JosephTremoulet.
sanjoy added a subscriber: llvm-commits.

This change generalizes the implicit null checks pass to work with
instructions that don't have any explicit register defs.  This lets us
use X86's `cmp` against memory as faulting load instructions.

http://reviews.llvm.org/D11286

Files:
  lib/CodeGen/ImplicitNullChecks.cpp
  lib/Target/X86/X86MCInstLower.cpp
  test/CodeGen/X86/implicit-null-check.ll

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