rs6000/testsuite: Use -mdejagnu-cpu= instead of -mcpu=

rs6000/testsuite: Use -mdejagnu-cpu= instead of -mcpu=

A bunch of new cases snuck in.

2020-05-15  Segher Boessenkool  <segher@kernel.crashing.org>

gcc/testsuite/
	* gcc.target/powerpc/pdep-0.c: Change -mcpu= to -mdejagnu-cpu=.
	* gcc.target/powerpc/pdep-1.c: Ditto.
	* gcc.target/powerpc/pextd-0.c: Ditto.
	* gcc.target/powerpc/pextd-1.c: Ditto.
	* gcc.target/powerpc/pr90763.c: Ditto.
	* gcc.target/powerpc/pr91275.c: Ditto.
	* gcc.target/powerpc/pr92796.c: Ditto.
	* gcc.target/powerpc/pr93658.c: Ditto.
	* gcc.target/powerpc/pr93800.c: Ditto.
	* gcc.target/powerpc/setbceq.c: Ditto.
	* gcc.target/powerpc/setbcge.c: Ditto.
	* gcc.target/powerpc/setbcgt.c: Ditto.
	* gcc.target/powerpc/setbcle.c: Ditto.
	* gcc.target/powerpc/setbclt.c: Ditto.
	* gcc.target/powerpc/setbcne.c: Ditto.
	* gcc.target/powerpc/setnbceq.c: Ditto.
	* gcc.target/powerpc/setnbcge.c: Ditto.
	* gcc.target/powerpc/setnbcgt.c: Ditto.
	* gcc.target/powerpc/setnbcle.c: Ditto.
	* gcc.target/powerpc/setnbclt.c: Ditto.
	* gcc.target/powerpc/setnbcne.c: Ditto.
	* gcc.target/powerpc/xxgenpc-runnable.c: Ditto.