* ldlang.h (struct lang_output_section_state): Change processed

	field's type.
	* ldexp.c (check, invalid): Remove.
	(fold_name): Move valid_p assignments. Create undefined symbol
	when needed. Directly exampine section's processd flag.
	* ldlang.c (lang_output_section_statement_lookup): Adjust
	processed field init.
	(lang_size_sections_1): Allow LOADADDR when determining section's
	VMA. Adjust error message. Fold data statement's expr.
	(lang_size_sections): Correctly increment lang_statement_iteration.

	* ld-scripts/provide.exp: New.
	* ld-scripts/provide-{1,2,3}.{s,t,d}.exp: New.

	* ldexp.c (fold_tree): Follow indirect symbols.