OpenMP/Fortran: Reject ALLOCATE on non-local static variables with trait:cgroup/pteam...

OpenMP/Fortran: Reject ALLOCATE on non-local static variables with trait:cgroup/pteam/thread [PR122892]

OpenMP 6.0 clarified that static-storage objects may only specify the
omp_cgroup_mem_alloc, omp_pteam_mem_alloc, or omp_thread_mem_alloc allocator
inside a BLOCK or procedure. Let's check for this for Fortran.

	PR c/122892

gcc/fortran/ChangeLog:

	* openmp.cc (gfc_resolve_omp_allocate): Reject non-local
	static variables with cgroup/pteam/thread allocators.
	* parse.cc: Permit OMP ALLOCATE in BLOCK DATA.

gcc/testsuite/ChangeLog:

	* gfortran.dg/gomp/allocate-15.f90: Use another allocator as
	omp_{cgroup,pteam}_mem_alloc is invalid for non-local static vars.
	* gfortran.dg/gomp/allocate-7.f90: Likewise.
	* gfortran.dg/gomp/allocate-static-3.f90: New test.