[MIR-Canon] Fixing case where MachineFunction is empty.
In cases where the machine function is empty: bail on the RPO traversal. Differential Revision: https://reviews.llvm.org/D62617 llvm-svn: 362158
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In cases where the machine function is empty: bail on the RPO traversal. Differential Revision: https://reviews.llvm.org/D62617 llvm-svn: 362158