gcc/fortran/
	* decl.c (gfc_match_parameter): Allow omitted '()' with -std=legacy.
	* parse.c (decode_statement): Match "parameter" before assignments.
	* gfortran.texi: Document.

	gcc/testsuite/gfortran.dg/
	* dec_parameter_1.f: New test.
	* dec_parameter_2.f90: Likewise.
	* dec_parameter_3.f90: Likewise.
	* dec_parameter_4.f90: Likewise.

From-SVN: r241823