cris: Add new pass eliminating compares after delay-slot-filling

cris: Add new pass eliminating compares after delay-slot-filling

Delayed-branch-slot-filling a.k.a. reorg or dbr, often causes
opportunities for more compare-elimination than were visible for
the cmpelim pass.  With cc0, these were caught by the
elimination pass run in "final", thus the missed opportunities
is a regression.  A simple reorg-aware pass run just after reorg
handles most of them, if not all.  I chose to keep the "mach2"
pass identifier string I copy-pasted from the SPARC port instead
of inventing one like "postdbr_cmpelim".  Note the gap in numbers
in the test-case file names.

gcc:
	PR target/93372
	* config/cris/cris-passes.def: New file.
	* config/cris/t-cris (PASSES_EXTRA): Add cris-passes.def.
	* config/cris/cris.c: Add infrastructure bits and pass execute
	function cris_postdbr_cmpelim.
	* config/cris/cris-protos.h (make_pass_cris_postdbr_cmpelim): Declare.

gcc/testsuite:
	* gcc.target/cris/pr93372-44.c, gcc.target/cris/pr93372-46.c: New.