Use "-fopenacc-kernels=parloops" to document "parloops" test cases

Use "-fopenacc-kernels=parloops" to document "parloops" test cases

	gcc/
	* flag-types.h (enum openacc_kernels): New type.
	gcc/c-family/
	* c.opt (fopenacc-kernels): New flag.
	gcc/fortran/
	* lang.opt (fopenacc-kernels): New flag.
	gcc/testsuite/
	* c-c++-common/goacc/kernels-1.c: Add
	"-fopenacc-kernels=parloops".
	* c-c++-common/goacc/kernels-acc-loop-reduction.c: Likewise.
	* c-c++-common/goacc/kernels-acc-loop-smaller-equal.c: Likewise.
	* c-c++-common/goacc/kernels-alias-2.c: Likewise.
	* c-c++-common/goacc/kernels-alias-3.c: Likewise.
	* c-c++-common/goacc/kernels-alias-4.c: Likewise.
	* c-c++-common/goacc/kernels-alias-5.c: Likewise.
	* c-c++-common/goacc/kernels-alias-6.c: Likewise.
	* c-c++-common/goacc/kernels-alias-7.c: Likewise.
	* c-c++-common/goacc/kernels-alias-8.c: Likewise.
	* c-c++-common/goacc/kernels-alias-ipa-pta-2.c: Likewise.
	* c-c++-common/goacc/kernels-alias-ipa-pta-3.c: Likewise.
	* c-c++-common/goacc/kernels-alias-ipa-pta-4.c: Likewise.
	* c-c++-common/goacc/kernels-alias-ipa-pta.c: Likewise.
	* c-c++-common/goacc/kernels-alias.c: Likewise.
	* c-c++-common/goacc/kernels-counter-var-redundant-load.c:
	Likewise.
	* c-c++-common/goacc/kernels-counter-vars-function-scope.c:
	Likewise.
	* c-c++-common/goacc/kernels-double-reduction-n.c: Likewise.
	* c-c++-common/goacc/kernels-double-reduction.c: Likewise.
	* c-c++-common/goacc/kernels-loop-2-acc-loop.c: Likewise.
	* c-c++-common/goacc/kernels-loop-2.c: Likewise.
	* c-c++-common/goacc/kernels-loop-3-acc-loop.c: Likewise.
	* c-c++-common/goacc/kernels-loop-3.c: Likewise.
	* c-c++-common/goacc/kernels-loop-acc-loop.c: Likewise.
	* c-c++-common/goacc/kernels-loop-data-2.c: Likewise.
	* c-c++-common/goacc/kernels-loop-data-enter-exit-2.c: Likewise.
	* c-c++-common/goacc/kernels-loop-data-enter-exit.c: Likewise.
	* c-c++-common/goacc/kernels-loop-data-update.c: Likewise.
	* c-c++-common/goacc/kernels-loop-data.c: Likewise.
	* c-c++-common/goacc/kernels-loop-g.c: Likewise.
	* c-c++-common/goacc/kernels-loop-mod-not-zero.c: Likewise.
	* c-c++-common/goacc/kernels-loop-n-acc-loop.c: Likewise.
	* c-c++-common/goacc/kernels-loop-n.c: Likewise.
	* c-c++-common/goacc/kernels-loop-nest.c: Likewise.
	* c-c++-common/goacc/kernels-loop.c: Likewise.
	* c-c++-common/goacc/kernels-one-counter-var.c: Likewise.
	* c-c++-common/goacc/kernels-parallel-loop-data-enter-exit.c:
	Likewise.
	* c-c++-common/goacc/kernels-reduction.c: Likewise.
	* gfortran.dg/goacc/kernels-alias-2.f95: Likewise.
	* gfortran.dg/goacc/kernels-alias-3.f95: Likewise.
	* gfortran.dg/goacc/kernels-alias-4.f95: Likewise.
	* gfortran.dg/goacc/kernels-alias.f95: Likewise.
	* gfortran.dg/goacc/kernels-loop-2.f95: Likewise.
	* gfortran.dg/goacc/kernels-loop-data-2.f95: Likewise.
	* gfortran.dg/goacc/kernels-loop-data-enter-exit-2.f95: Likewise.
	* gfortran.dg/goacc/kernels-loop-data-enter-exit.f95: Likewise.
	* gfortran.dg/goacc/kernels-loop-data-update.f95: Likewise.
	* gfortran.dg/goacc/kernels-loop-data.f95: Likewise.
	* gfortran.dg/goacc/kernels-loop-inner.f95: Likewise.
	* gfortran.dg/goacc/kernels-loop-n.f95: Likewise.
	* gfortran.dg/goacc/kernels-loop.f95: Likewise.
	* gfortran.dg/goacc/kernels-loops-adjacent.f95: Likewise.
	* gfortran.dg/goacc/kernels-parallel-loop-data-enter-exit.f95:
	Likewise.
	libgomp/
	* testsuite/libgomp.oacc-c-c++-common/kernels-alias-ipa-pta-2.c:
	Add "-fopenacc-kernels=parloops".
	* testsuite/libgomp.oacc-c-c++-common/kernels-alias-ipa-pta-3.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/kernels-alias-ipa-pta.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/kernels-empty.c: Likewise.
	* testsuite/libgomp.oacc-c-c++-common/kernels-loop-2.c: Likewise.
	* testsuite/libgomp.oacc-c-c++-common/kernels-loop-3.c: Likewise.
	* testsuite/libgomp.oacc-c-c++-common/kernels-loop-and-seq-2.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/kernels-loop-and-seq-3.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/kernels-loop-and-seq-4.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/kernels-loop-and-seq-5.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/kernels-loop-and-seq-6.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/kernels-loop-and-seq.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/kernels-loop-collapse.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/kernels-loop-data-2.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/kernels-loop-data-enter-exit-2.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/kernels-loop-data-enter-exit.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/kernels-loop-data-update.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/kernels-loop-data.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/kernels-loop-g.c: Likewise.
	* testsuite/libgomp.oacc-c-c++-common/kernels-loop-mod-not-zero.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/kernels-loop-n.c: Likewise.
	* testsuite/libgomp.oacc-c-c++-common/kernels-loop-nest.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/kernels-loop.c: Likewise.
	* testsuite/libgomp.oacc-c-c++-common/kernels-parallel-loop-data-enter-exit.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/kernels-reduction-1.c:
	Likewise.
	* testsuite/libgomp.oacc-c-c++-common/kernels-reduction.c:
	Likewise.
	* testsuite/libgomp.oacc-fortran/kernels-loop-2.f95: Likewise.
	* testsuite/libgomp.oacc-fortran/kernels-loop-data-2.f95:
	Likewise.
	* testsuite/libgomp.oacc-fortran/kernels-loop-data-enter-exit-2.f95:
	Likewise.
	* testsuite/libgomp.oacc-fortran/kernels-loop-data-enter-exit.f95:
	Likewise.
	* testsuite/libgomp.oacc-fortran/kernels-loop-data-update.f95:
	Likewise.
	* testsuite/libgomp.oacc-fortran/kernels-loop-data.f95: Likewise.
	* testsuite/libgomp.oacc-fortran/kernels-loop.f95: Likewise.
	* testsuite/libgomp.oacc-fortran/kernels-parallel-loop-data-enter-exit.f95:
	Likewise.
	* testsuite/libgomp.oacc-fortran/kernels-reduction-1.f90:
	Likewise.

(cherry picked from openacc-gcc-9-branch commit
ff54f28eee8129e9f72d88d0a6d1d15604f652ca)