varasm.c (struct varasm_status): Change x_const_rtx_sym_hash_table to array of pool_constnat pointers.

	* varasm.c (struct varasm_status): Change x_const_rtx_sym_hash_table
	to array of pool_constnat pointers.
	(struct pool_constant): Add next_sym and label members.
	(struct pool_sym): Remove.
	(init_varasm_status): Change pool_sym into pool_constant.
	(mark_pool_constant): Mark pc->label string as well.
	(mark_pool_sym_hash_table): Remove.
	(mark_varasm_status): Remove it from caller as well.
	(free_varasm_status): Don't free pool_sym structures.
	(force_const_mem): Don't allocate pool_sym structure, instead
	fill pool->label and chain it into rtx_sym hash table.
	(find_pool_constant, mark_constant_pool): Use pool_constant instead
	of pool_sym.

From-SVN: r37451