regrename creates invalid insn

[Ian Lance Taylor]

Andreas Schwab <schwab@linux-m68k.org> writes:

> Ian Lance Taylor <iant@google.com> writes:
>
>> But it also looks like the pattern should use a match_scratch.
>
> It is also used as input in operand 2.

Sorry, I missed that.

This still seems like a bug in regrename to me, but it also seems like
an unusual case, so it is less surprising that it hasn't been seen
before.

Ian