pru: Add cbranchdi4 pattern

pru: Add cbranchdi4 pattern

Manually expanding into 32-bit comparisons is much more efficient than
the default expansion into word-size comparisons.  Note that word for PRU
is 8-bit.

	PR target/106562

gcc/ChangeLog:

	* config/pru/pru-protos.h (pru_noteq_condition): New
	function declaration.
	* config/pru/pru.cc (pru_noteq_condition): New function.
	* config/pru/pru.md (cbranchdi4): Define new pattern.

gcc/testsuite/ChangeLog:

	* gcc.target/pru/pr106562-1.c: New test.
	* gcc.target/pru/pr106562-2.c: New test.
	* gcc.target/pru/pr106562-3.c: New test.
	* gcc.target/pru/pr106562-4.c: New test.

Signed-off-by: Dimitar Dimitrov <dimitar@dinux.eu>