[wasm] Add functionality to decode a function offset table

src/wasm/wasm-result.h

 // Copyright 2015 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.
 
 #ifndef V8_WASM_RESULT_H_
 #define V8_WASM_RESULT_H_
 
 #include "src/base/compiler-specific.h"
 #include "src/base/smart-pointers.h"
 
@@ skipping 20 matching lines @@
   kTypeError,             // type mismatch
   kInvalidLocalIndex,     // invalid local
   kInvalidGlobalIndex,    // invalid global
   kInvalidFunctionIndex,  // invalid function
   kInvalidMemType         // invalid memory type
 };
 
 // The overall result of decoding a function or a module.
 template <typename T>
 struct Result {
-  Result()
-      : val(nullptr), error_code(kSuccess), start(nullptr), error_pc(nullptr) {
+  Result() : val(), error_code(kSuccess), start(nullptr), error_pc(nullptr) {
     error_msg.Reset(nullptr);
   }
 
   T val;
   ErrorCode error_code;
   const byte* start;
   const byte* error_pc;
   const byte* error_pt;
   base::SmartArrayPointer<char> error_msg;
 
@@ skipping 55 matching lines @@
  private:
   Isolate* isolate_;
   const char* context_;
   bool error_;
 };
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif