re PR fortran/56674 (ICE in check_sym_interfaces)

re PR fortran/56674 (ICE in check_sym_interfaces)

	PR fortran/56674
	PR fortran/58813
	PR fortran/59016
	PR fortran/59024
fortran/
	* symbol.c (save_symbol_data, gfc_save_symbol_data): Rename the
	former to the latter and make it non-static.  Update callers.
	* gfortran.h (gfc_save_symbol_data): New prototype.
	* decl.c (gfc_match_decl_type_spec): Call 'gfc_save_symbol_data'
	before modifying symbols 'sym' and 'dt_sym'.
testsuite/
	* gfortran.dg/used_types_27.f90: New.

From-SVN: r222078