Fortran: Support OpenMP's 'allocate' directive for stack vars

Fortran: Support OpenMP's 'allocate' directive for stack vars

gcc/fortran/ChangeLog:

	* gfortran.h (ext_attr_t): Add omp_allocate flag.
	* match.cc (gfc_free_omp_namelist): Void deleting same
	u2.allocator multiple times now that a sequence can use
	the same one.
	* openmp.cc (gfc_match_omp_clauses, gfc_match_omp_allocate): Use
	same allocator expr multiple times.
	(is_predefined_allocator): Make static.
	(gfc_resolve_omp_allocate): Update/extend restriction checks;
	remove sorry message.
	(resolve_omp_clauses): Reject corarrays in allocate/allocators
	directive.
	* parse.cc (check_omp_allocate_stmt): Permit procedure pointers
	here (rejected later) for less misleading diagnostic.
	* trans-array.cc (gfc_trans_auto_array_allocation): Propagate
	size for GOMP_alloc and location to which it should be added to.
	* trans-decl.cc (gfc_trans_deferred_vars): Handle 'omp allocate'
	for stack variables; sorry for static variables/common blocks.
	* trans-openmp.cc (gfc_trans_omp_clauses): Evaluate 'allocate'
	clause's allocator only once; fix adding expressions to the
	block.
	(gfc_trans_omp_single): Pass a block to gfc_trans_omp_clauses.

gcc/ChangeLog:

	* gimplify.cc (gimplify_bind_expr): Handle Fortran's
	'omp allocate' for stack variables.

libgomp/ChangeLog:

	* libgomp.texi (OpenMP Impl. Status): Mention that Fortran now
	supports the allocate directive for stack variables.
	* testsuite/libgomp.fortran/allocate-5a.f90: Renamed from
	testsuite/libgomp.fortran/allocate-5.f90.
	* testsuite/libgomp.fortran/allocate-5.f90: New test.
	* testsuite/libgomp.fortran/allocate-6.f90: New test.
	* testsuite/libgomp.fortran/allocate-7.f90: New test.
	* testsuite/libgomp.fortran/allocate-8.f90: New test.

gcc/testsuite/ChangeLog:

	* c-c++-common/gomp/allocate-14.c: Fix directive name.
	* c-c++-common/gomp/allocate-15.c: Likewise.
	* c-c++-common/gomp/allocate-9.c: Fix comment typo.
	* gfortran.dg/gomp/allocate-4.f90: Remove sorry dg-error.
	* gfortran.dg/gomp/allocate-7.f90: Likewise.
	* gfortran.dg/gomp/allocate-10.f90: New test.
	* gfortran.dg/gomp/allocate-11.f90: New test.
	* gfortran.dg/gomp/allocate-12.f90: New test.
	* gfortran.dg/gomp/allocate-13.f90: New test.
	* gfortran.dg/gomp/allocate-14.f90: New test.
	* gfortran.dg/gomp/allocate-15.f90: New test.
	* gfortran.dg/gomp/allocate-8.f90: New test.
	* gfortran.dg/gomp/allocate-9.f90: New test.

(cherry picked from commit 969f5c3eaa7f073f532206ced0f177b4eb58aee2)