re PR debug/87039 (DW_OP_fbreg used without a frame base on a C++ code w/ -fopenmp)

re PR debug/87039 (DW_OP_fbreg used without a frame base on a C++ code w/ -fopenmp)

	PR debug/87039
	* omp-expand.c: Don't include debug.h.
	(adjust_context_and_scope): Add REGION argument.  Find DECL_CONTEXT
	from innermost outer parallel, task, teams or target that has a
	child_fn set, or, if there is no such outer region, use
	current_function_decl.  Do the DECL_CONTEXT adjustment regardless of
	whether a suitable BLOCK is found or not.
	(expand_parallel_call, expand_teams_call): Don't call
	adjust_context_and_scope here.
	(grid_expand_target_grid_body): Revert 2017-01-25 changes.
	(expand_omp_taskreg, expand_omp_target): Likewise.  Call
	adjust_context_and_scope.
	* dwarf2out.c (dwarf2out_early_global_decl): For
	decl_function_context recurse instead of calling dwarf2out_decl.

	* g++.dg/gomp/pr78363-4.C: New test.
	* g++.dg/gomp/pr78363-5.C: New test.
	* g++.dg/gomp/pr78363-6.C: New test.
	* g++.dg/gomp/pr78363-7.C: New test.

From-SVN: r266272