PR c++/39095
	* operators.def: Use COMPONENT_REF code for ->/pt operator again,
	remove ./dt operator.
	* mangle.c (write_expression): Handle COMPONENT_REF after handling
	ADDR_EXPR, for COMPONENT_REF without ARROW_EXPR inside of it
	write_string ("dt") instead of using operators.def.

	* g++.dg/abi/mangle31.C: New test.

From-SVN: r143933