rs6000: Update testsuite to use -mdejagnu-cpu= and -mdejagnu-tune= options

rs6000: Update testsuite to use -mdejagnu-cpu= and -mdejagnu-tune= options

This patch updates the POWER testsuite test cases using -mcpu= and -mtune=
to use the preferred -mdejagnu-cpu= and -mdejagnu-tune= options.  This also
obviates the need for the dg-skip-if directive, since the user cannot
override the -mcpu= value being used to compile the test case.

2022-03-25  Peter Bergner  <bergner@linux.ibm.com>

gcc/testsuite/

	* g++.dg/pr65240-1.C: Use -mdejagnu-cpu=.  Remove dg-skip-if.
	* g++.dg/pr65240-2.C: Likewise.
	* g++.dg/pr65240-3.C: Likewise.
	* g++.dg/pr65240-4.C: Likewise.
	* g++.dg/pr65242.C: Likewise.
	* g++.dg/pr67211.C: Likewise.
	* g++.dg/pr69667.C: Likewise.
	* g++.dg/pr71294.C: Likewise.
	* g++.dg/pr84279.C: Likewise.
	* g++.dg/torture/ppc-ldst-array.C: Likewise.
	* gfortran.dg/nint_p7.f90: Likewise.
	* gfortran.dg/pr102860.f90: Likewise.
	* gcc.target/powerpc/fusion.c: Use -mdejagnu-cpu= and -mdejagnu-tune=.
	* gcc.target/powerpc/fusion2.c: Likewise.
	* gcc.target/powerpc/test_mffsl.c: Likewise.
	* gfortran.dg/pr47614.f: Likewise.
	* gfortran.dg/pr58968.f: Likewise.

(cherry picked from commit 81faedaa8e2819fc0ffda4ce0a888065a6d7a535)