[DWARF] Also generate DW_OP_GNU_variable_value at file scope

[Eric Botcazou]

But only for the reference variant (dw_val_class_die_ref).  This is needed for 
variable-sized types declared at library level in Ada.

Tested on x86-64/Linux, both GCC and GDB, OK for the mainline?


2021-05-28  Eric Botcazou  <ebotcazou@adacore.com>

	* dwarf2out.c (loc_list_from_tree_1) <FUNCTION_DECL>: Also generate
	DW_OP_GNU_variable_value referencing an existing DIE at file scope.
	(type_byte_size): Inline into...
	(add_byte_size_attribute): ...this and call add_scalar_info.

-- 
Eric Botcazou
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