Fortran: Implement PDT constructors with syntax variants [PR114815]

Fortran: Implement PDT constructors with syntax variants [PR114815]

2025-09-18  Paul Thomas  <pault@gcc.gnu.org>

gcc/fortran
	PR fortran/114815
	* decl.cc (gfc_get_pdt_instance): Copy the contents of 'tb' and
	not the pointer.
	* primary.cc (gfc_match_rvalue): If there is only one actual
	argument list, use if for the type spec parameter values. If
	this fails try the default type specification values and use
	the actual arguments for the component values.
	* resolve.cc (build_init_assign): Don't initialize implicit PDT
	function results.

gcc/testsuite/
	PR fortran/114815
	* gfortran.dg/pdt_3.f03: Add missing deallocation of 'matrix'.
	* gfortran.dg/pdt_17.f03: Change dg-error text.
	* gfortran.dg/pdt_47.f03: New test.