[wasm] Enforce that function bodies end with the \"end\" opcode.

test/debugger/debug/wasm/frame-inspection.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-wasm
 
 load("test/mjsunit/wasm/wasm-constants.js");
 load("test/mjsunit/wasm/wasm-module-builder.js");
 
 Debug = debug.Debug
 
 var exception = null;
 var break_count = 0;
 
 const expected_frames = [
   // func-name; wasm?; pos; line; col
   ['call_debugger', false],        // --
-  ['wasm_2', true, 56, 2, 0],      // --
-  ['wasm_1', true, 52, 3, 0],      // --
+  ['wasm_2', true, 56, 2, 2],      // --
+  ['wasm_1', true, 52, 3, 2],      // --
   ['testFrameInspection', false],  // --
   ['', false]
 ];
 
 function listener(event, exec_state, event_data, data) {
   if (event != Debug.DebugEvent.Break) return;
   ++break_count;
   try {
     var break_id = exec_state.break_id;
     var frame_count = exec_state.frameCount();
@@ skipping 33 matching lines @@
 var module = builder.instantiate({mod: {func: call_debugger}});
 
 (function testFrameInspection() {
   Debug.setListener(listener);
   module.exports.main();
   Debug.setListener(null);
 
   assertEquals(1, break_count);
   if (exception) throw exception;
 })();