gen_stub: fix invalid C variable name for namespaced types in union/intersection type list

When generating a union or intersection type list with multiple class
types, the variable holding each zend_string* was declared using
toVarEscapedName() (backslashes replaced by underscores), but the
subsequent ZEND_TYPE_INIT_CLASS() reference used toEscapedName()
(backslashes escaped as \\), producing an invalid C identifier.

Author: GromNaN

build/gen_stub.php

@@ -2375,8 +2375,8 @@ protected function getTypeCode(string $variableLikeName, string &$code): string
                     $code .= "\t{$variableLikeType}_{$variableLikeName}_type_list->num_types = $classTypeCount;\n";
 
                     foreach ($arginfoType->classTypes as $k => $classType) {
-                        $escapedClassName = $classType->toEscapedName();
-                        $code .= "\t{$variableLikeType}_{$variableLikeName}_type_list->types[$k] = (zend_type) ZEND_TYPE_INIT_CLASS({$variableLikeType}_{$variableLikeName}_class_{$escapedClassName}, 0, 0);\n";
+                        $varEscapedClassName = $classType->toVarEscapedName();
+                        $code .= "\t{$variableLikeType}_{$variableLikeName}_type_list->types[$k] = (zend_type) ZEND_TYPE_INIT_CLASS({$variableLikeType}_{$variableLikeName}_class_{$varEscapedClassName}, 0, 0);\n";
                     }
 
                     $typeMaskCode = $this->type->toArginfoType()->toTypeMask();