RFA: (partially) fix PR middle-end/29846

Joern RENNECKE joern.rennecke@st.com
Wed Nov 15 18:57:00 GMT 2006

This patch makes can_compare_p acknowledge the existance of a 
cbranch<MODE>4 handler,
without being confused by a compare pattern.  In principle, it would 
make sense to also
do a similar change for cmov_optab / cstore_optab, but we should first 
make sure that we
can actually do something useful with these optabs first.

I have tested this patch on i686-pc-linux-gnu with a native bootstrap, 
and also as
part of the patch for PR29845 on i686-pc-linux-gnu X sh-elf.

:ADDPATCH middle-end:
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