* dwarf2expr.h (dwarf2_read_address): Add gdbarch argument.

	* dwarf2expr.h (dwarf2_read_address): Add gdbarch argument.
	* dwarf2expr.c (dwarf2_read_address): Add gdbarch argument.
	Call gdbarch_integer_to_address directly instead of converting
	to value and back.  Update comment.
	(execute_stack_op): Update call site.
	* dwarf2loc.c (find_location_expression): Likewise.
	(locexpr_describe_location): Update

	* dwarf2expr.h (struct dwarf_expr_context): Add gdbarch member.
	* dwarf2-frame.c (execute_stack_op): Initialize ctx->gdbarch.
	* dwarf2loc. (dwarf2_evaluate_loc_desc): Likewise.
	(dwarf2_loc_desc_needs_frame): Likewise.