[esnext] Fix various callsites to use is_resumable, not is_generator

test/mjsunit/debug-generator-break.js

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Flags: --expose-debug-as debug
 
 var Debug = debug.Debug;
 
 var break_count = 0;
 var exception = null;
 
 function listener(event, exec_state, event_data, data) {
   if (event != Debug.DebugEvent.Break) return;
   try {
     break_count++;
     var line = exec_state.frame(0).sourceLineText();
     assertTrue(line.indexOf(`B${break_count}`) > 0);
   } catch (e) {
     exception = e;
   }
 }
 
 Debug.setListener(listener);
 
-function g() {
-  throw 1;
+function* g() {
+  yield 1;
 }
 
-function f() {
-  try {
-    g();                         // B1
-  } catch (e) {}
+function* f() {
+  yield* g();                    // B1
   assertEquals(2, break_count);  // B2
   return 1;                      // B3
 }
 
-Debug.setBreakPoint(f, 2, 0);
-Debug.setBreakPoint(f, 4, 1);
-Debug.setBreakPoint(f, 5, 1);
+Debug.setBreakPoint(f, 1);
+Debug.setBreakPoint(f, 2);
+Debug.setBreakPoint(f, 3);
 
-f();
+for (let _ of f()) { }
 
 assertEquals(3, break_count);
 assertNull(exception);
 
 Debug.setListener(null);