GTY: Clean up obsolete parametrized structs remnants

Support removed in 2014 with
commit 63f5d5b818 (Subversion r218558)
"remove gengtype support for param_is use_param, if_marked and splay tree allocators".

	gcc/
	* gengtype-parse.cc: Clean up obsolete parametrized structs
	remnants.
	* gengtype.cc: Likewise.
	* gengtype.h: Likewise.

gcc/gengtype-parse.cc

@@ -82,7 +82,6 @@ static const char *const token_names[] = {
   "ptr_alias",
   "nested_ptr",
   "user",
-  "a param<N>_is option",
   "a number",
   "a scalar type",
   "an identifier",
@@ -95,7 +94,6 @@ static const char *const token_names[] = {
 /* This array is indexed by token code minus FIRST_TOKEN_WITH_VALUE.  */
 /* Keep in sync with 'gengtype.h:enum gty_token'.  */
 static const char *const token_value_format[] = {
-  "%s",
   "'%s'",
   "'%s'",
   "'%s'",

gcc/gengtype.cc

@@ -1388,8 +1388,6 @@ adjust_field_rtx_def (type_p t, options_p ARG_UNUSED (opt))
    At present:
    - Converts pointer-to-char, with no length parameter, to TYPE_STRING;
    - Similarly for arrays of pointer-to-char;
-   - Converts structures for which a parameter is provided to
-     TYPE_PARAM_STRUCT;
    - Handles "special" options.
 */
 
@@ -3654,7 +3652,7 @@ write_func_for_structure (type_p orig_s, type_p s,
 }
 
 
-/* Write out marker routines for STRUCTURES and PARAM_STRUCTS.  */
+/* Write out marker routines for STRUCTURES.  */
 
 static void
 write_types (outf_p output_header, type_p structures,
@@ -4002,7 +4000,7 @@ write_local_func_for_structure (const_type_p orig_s, type_p s)
       }
 }
 
-/* Write out local marker routines for STRUCTURES and PARAM_STRUCTS.  */
+/* Write out local marker routines for STRUCTURES.  */
 
 static void
 write_local (outf_p output_header, type_p structures)

gcc/gengtype.h

@@ -478,7 +478,6 @@ enum gty_token
   PTR_ALIAS,
   NESTED_PTR,
   USER_GTY,
-  UNUSED_PARAM_IS,
   NUM,
   SCALAR,
   ID,
@@ -489,7 +488,7 @@ enum gty_token
 
   /* print_token assumes that any token >= FIRST_TOKEN_WITH_VALUE may have
      a meaningful value to be printed.  */
-  FIRST_TOKEN_WITH_VALUE = UNUSED_PARAM_IS
+  FIRST_TOKEN_WITH_VALUE = NUM
 };