OpenMP: Reject non-const 'condition' trait in Fortran

OpenMP 5.0 only permits constant expressions for the 'condition' trait
in context selectors; this is relaxed in 5.2 but not implemented. In order
to avoid wrong code, it is now rejected.

Additionally, in Fortran, 'condition' should not accept an integer
expression, which is now ensured. Additionally, as 'device_num' should be
a conforming device number, there is now a check on the value.

	PR middle-end/113904

gcc/c/ChangeLog:

	* c-parser.cc (c_parser_omp_context_selector): Handle splitting of
	OMP_TRAIT_PROPERTY_EXPR into OMP_TRAIT_PROPERTY_{DEV_NUM,BOOL}_EXPR.

gcc/cp/ChangeLog:

	* parser.cc (cp_parser_omp_context_selector): Handle splitting of
	OMP_TRAIT_PROPERTY_EXPR into OMP_TRAIT_PROPERTY_{DEV_NUM,BOOL}_EXPR.

gcc/fortran/ChangeLog:

	* trans-openmp.cc (gfc_trans_omp_declare_variant): Handle splitting of
	OMP_TRAIT_PROPERTY_EXPR into OMP_TRAIT_PROPERTY_{DEV_NUM,BOOL}_EXPR.
	* openmp.cc (gfc_match_omp_context_selector): Likewise; rejects
	non-const device_num/condition; improve diagnostic.

gcc/ChangeLog:

	* omp-general.cc (struct omp_ts_info): Update for splitting of
	OMP_TRAIT_PROPERTY_EXPR into OMP_TRAIT_PROPERTY_{DEV_NUM,BOOL}_EXPR.
	* omp-selectors.h (enum omp_tp_type): Replace
	OMP_TRAIT_PROPERTY_EXPR by OMP_TRAIT_PROPERTY_{DEV_NUM,BOOL}_EXPR.

gcc/testsuite/ChangeLog:

	* gfortran.dg/gomp/declare-variant-1.f90: Change 'condition' trait's
	argument from integer to a logical expression.
	* gfortran.dg/gomp/declare-variant-11.f90: Likewise.
	* gfortran.dg/gomp/declare-variant-12.f90: Likewise.
	* gfortran.dg/gomp/declare-variant-13.f90: Likewise.
	* gfortran.dg/gomp/declare-variant-2.f90: Likewise.
	* gfortran.dg/gomp/declare-variant-2a.f90: Likewise.
	* gfortran.dg/gomp/declare-variant-3.f90: Likewise.
	* gfortran.dg/gomp/declare-variant-4.f90: Likewise.
	* gfortran.dg/gomp/declare-variant-6.f90: Likewise.
	* gfortran.dg/gomp/declare-variant-8.f90: Likewise.
	* gfortran.dg/gomp/declare-variant-20.f90: New test.