Kai Luo b200c5180e Reland [MachineCopyPropagation] Extend MCP to do trivial copy backward propagation.
Fix assertion error
```
bool llvm::MachineOperand::isRenamable() const: Assertion `Register::isPhysicalRegister(getReg()) && "isRenamable should only be checked on physical registers"' failed.
```
by checking if the register is 0 before invoking `isRenamable`.
2019-12-05 14:32:11 +08:00
..
2019-05-14 03:11:24 +00:00
2019-04-29 23:25:33 +00:00
2019-03-29 17:35:56 +00:00