- Use the new interface TargetInstrInfo::isRegisterOperandPCRel to tell MachineVerifier whether a specific register operand is legal to have OPERAND_PCREL. Since some of the pc-relative addressing modes in M68K involve (non-pc) registers.
- Make MachineBasicBlock::findDebugLoc to work on reverse_iterator.
I'm not sure, is there a policy to enforce this? Because there is a default implementation here (i.e. return false) so functionally it works. Also some of the functions, the isCopyInstrImpl below for example, don't have implementations in every derived targets either
There is no policy regarding this. Just now reading the MachineVerrifier again, it seems as this does not change the implementation for any other target that doesn't implement. No worries.