Fix names of various macro parameters in tree.h

Fix names of various macro parameters in tree.h

	* tree.h (EXCEPTIONAL_CLASS_P): Rename parameter from "CODE"
	to "NODE", since this works on a "tree", not an
	"enum tree_code".
	(CONSTANT_CLASS_P): Likewise.
	(TYPE_P): Likewise.
	(DECL_P): Likewise.
	(INDIRECT_REF_P): Likewise.
	(REFERENCE_CLASS_P): Likewise.
	(COMPARISON_CLASS_P): Likewise.
	(UNARY_CLASS_P): Likewise.
	(BINARY_CLASS_P): Likewise.
	(STATEMENT_CLASS_P): Likewise.
	(VL_EXP_CLASS_P): Likewise.
	(EXPRESSION_CLASS_P): Likewise.
	(IS_TYPE_OR_DECL_P): Likewise.

From-SVN: r204070