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Note: This was originally reverted to track down a buildbot error. Reapply without any modifications. Original commit message: This change materializes now the value "0" from the zero register. The zero register can be folded by several instruction, so no materialization is need at all. Fixes <rdar://problem/17924413>. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216009 91177308-0d34-0410-b5e6-96231b3b80d8