[Bug target/67260] [sh] Register spill bug for sibcall+complex+softfloat

[bugdal at aerifal dot cx]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67260

--- Comment #18 from Rich Felker <bugdal at aerifal dot cx> ---
I thought I fixed at least one occurrence of this when I forward-ported the
FDPIC patch, but in any case, if it changed since that patch was first written
then there's almost surely a log entry and hopefully a bz explaining the change
to &k which might shed some light on the history of this code and why it's done
the way it is.