[Bug middle-end/70561] Crash in recog_for_combine_1

[vogt at linux dot vnet.ibm.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70561

--- Comment #2 from Dominik Vogt <vogt at linux dot vnet.ibm.com> ---
(Ah, probably add_clobbers should have added the clobber, but it hasn't.  It
doesn't have any code for that pattern.)