Handle <undef> flag in machine code verifier.
Use of an <undef> register is treated like an <imp-use>. It is not an error to use a dead <undef> register. llvm-svn: 77890
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Use of an <undef> register is treated like an <imp-use>. It is not an error to use a dead <undef> register. llvm-svn: 77890