fix(zend): drop const-discarding qualifiers and unused grammar nonterminal

Signed-off-by: azjezz <azjezz@protonmail.com>

Author: azjezz

Zend/zend_compile.c

@@ -466,7 +466,7 @@ static void zend_generic_scope_pop(void) /* {{{ */
 /* }}} */
 
 static zend_generic_parameter *zend_generic_lookup_full(
-		const zend_string *name, uint8_t *origin_out, uint32_t *index_out) /* {{{ */
+		zend_string *name, uint8_t *origin_out, uint32_t *index_out) /* {{{ */
 {
 	zend_string *lc_name = zend_string_tolower(name);
 	for (zend_generic_scope_entry *e = CG(generic_scope); e; e = e->outer) {
@@ -511,7 +511,7 @@ static int zend_generic_lookup_forward(const zend_string *name) /* {{{ */
 static bool zend_type_ast_has_generic_content(zend_ast *ast);
 static zend_type zend_compile_pre_erasure_typename(zend_ast *ast);
 
-static zend_generic_parameter *zend_generic_lookup(const zend_string *name) /* {{{ */
+static zend_generic_parameter *zend_generic_lookup(zend_string *name) /* {{{ */
 {
 	return zend_generic_lookup_full(name, NULL, NULL);
 }
@@ -760,15 +760,15 @@ static zend_generic_type_table *zend_generic_get_or_create_class_table(zend_clas
 	return ce->generic_types;
 }
 
-static zend_generic_parameter *zend_generic_lookup_name(const zend_ast *ast) /* {{{ */
+static zend_generic_parameter *zend_generic_lookup_name(zend_ast *ast) /* {{{ */
 {
 	if (!CG(generic_scope) || ast->kind != ZEND_AST_ZVAL) {
 		return NULL;
 	}
 	if ((ast->attr & ZEND_NAME_NOT_FQ) != ZEND_NAME_NOT_FQ) {
 		return NULL;
 	}
-	const zval *zv = zend_ast_get_zval(ast);
+	zval *zv = zend_ast_get_zval(ast);
 	if (Z_TYPE_P(zv) != IS_STRING) {
 		return NULL;
 	}

Zend/zend_language_parser.y

@@ -294,7 +294,7 @@ static YYSIZE_T zend_yytnamerr(char*, const char*);
 %type <ast> generic_type_parameter_list_inner generic_type_parameter
 %type <ast> optional_generic_type_parameter_bound optional_generic_type_parameter_default
 %type <ast> optional_generic_type_argument_list generic_type_argument_list
-%type <ast> generic_type_argument_list_inner generic_type_argument
+%type <ast> generic_type_argument_list_inner
 %type <ast> optional_call_type_argument_list call_type_argument_list call_type_argument_list_inner
 %type <ast> bound_class_name bound_class_name_reference
 
@@ -900,10 +900,6 @@ generic_type_argument_list_inner:
 			{ $$ = zend_ast_list_add($1, $3); }
 ;
 
-generic_type_argument:
-		type_expr            { $$ = $1; }
-;
-
 optional_call_type_argument_list:
 		%empty                                       { $$ = NULL; }
 	|	call_type_argument_list                      { $$ = $1; }