[wasm] Fix location for error in asm.js ToNumber conversion

src/isolate.h

 // Copyright 2012 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_ISOLATE_H_
 #define V8_ISOLATE_H_
 
 #include <memory>
 #include <queue>
 
@@ skipping 1053 matching lines @@
 
   void* stress_deopt_count_address() { return &stress_deopt_count_; }
 
   V8_EXPORT_PRIVATE base::RandomNumberGenerator* random_number_generator();
 
   // Generates a random number that is non-zero when masked
   // with the provided mask.
   int GenerateIdentityHash(uint32_t mask);
 
   // Given an address occupied by a live code object, return that object.
-  Object* FindCodeObject(Address a);
+  Code* FindCodeObject(Address a);
 
   int NextOptimizationId() {
     int id = next_optimization_id_++;
     if (!Smi::IsValid(next_optimization_id_)) {
       next_optimization_id_ = 0;
     }
     return id;
   }
 
   void AddCallCompletedCallback(CallCompletedCallback callback);
@@ skipping 596 matching lines @@
 
   EmbeddedVector<char, 128> filename_;
   FILE* file_;
   int scope_depth_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ISOLATE_H_