Merge "Fix HInstruction::ReplaceInput(), allow no-op." into nyc-dev
am: a86d664bf4

* commit 'a86d664bf476b094aa25c2d72c72e8e1f59a1591':
  Fix HInstruction::ReplaceInput(), allow no-op.

Change-Id: Ie4a7f825ff2e0aa0a206cba2b9e6421d8a180bfd