[PATCH] CodeGen: Don't iterate over operands after we've erased an MI

[Justin Bogner via llvm-commits]

Tim Northover <tnorthover at apple.com> writes:
>> This seemed like the most NFC way to fix this, but I'm not terribly
>> familiar with the RegisterCoalescer so let me know if there's a better
>> way.
>
> I'm not sure I'm very familiar either any more, but this looks like a
> reasonable change to me.

Thanks! r264455.