commit 9473ad83882eed0039db4550f960edb438bf5093
author Quentin Colombet <qcolombet@apple.com> Wed Apr 27 23:26:40 2016 +0000
committer Quentin Colombet <qcolombet@apple.com> Wed Apr 27 23:26:40 2016 +0000
tree a1b76436d8bb637978066b62443775ace72b919a
parent 0174eda0bc7c1f3414a68b1475a20b5839bda21c

[ImplicitNullChecks] Properly update the live-in of the block of the memory operation.

We basically replace:
HoistBB:
cond_br NullBB, NotNullBB

NullBB:
  ...

NotNullBB:
  <reg> = load

into
HoistBB
<reg> = load_faulting_op NullBB
uncond_br NotNullBB

NullBB:
  ...

NotNullBB: ## <reg> is now live-in of NotNullBB
  ...

This partially fixes the machine verifier error for
test/CodeGen/X86/implicit-null-check.ll, but it still fails because
of the implicit CFG structure.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267817 91177308-0d34-0410-b5e6-96231b3b80d8