ignore register zero in isRegTiedToUseOperand, following the example of
authorChris Lattner <sabre@nondot.org>
Thu, 9 Apr 2009 23:33:34 +0000 (23:33 +0000)
committerChris Lattner <sabre@nondot.org>
Thu, 9 Apr 2009 23:33:34 +0000 (23:33 +0000)
isRegTiedToDefOperand.  Thanks to Bob for pointing this out!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68734 91177308-0d34-0410-b5e6-96231b3b80d8


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