re PR fortran/45586 (ICE non-trivial conversion at assignment)

	PR fortran/45586
	* gfortran.h (struct gfc_component): Add norestrict_decl member.
	* trans.h (struct lang_type): Add nonrestricted_type member.
	* trans-expr.c (gfc_conv_component_ref): Search fields with correct
	parent type.
	* trans-types.c (mirror_fields, gfc_nonrestricted_type): New.
	(gfc_sym_type): Use it.

testsuite/
	PR fortran/45586
	* gfortran.dg/lto/pr45586_0.f90: New test.
	* gfortran.dg/typebound_proc_20.f90: Ditto.
	* gfortran.dg/typebound_proc_21.f90: Ditto.

From-SVN: r170284