[wasm] Names of exported functions should be the stringified function index.

src/wasm/wasm-objects.h

 // 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.
 
 #ifndef V8_WASM_OBJECTS_H_
 #define V8_WASM_OBJECTS_H_
 
 #include "src/debug/interface-types.h"
 #include "src/objects-inl.h"
 #include "src/trap-handler/trap-handler.h"
@@ skipping 124 matching lines @@
  public:
   enum Fields { kInstance, kIndex, kFieldCount };
 
   DECLARE_CASTS(WasmExportedFunction);
 
   WasmInstanceObject* instance();
   int function_index();
 
   static Handle<WasmExportedFunction> New(Isolate* isolate,
                                           Handle<WasmInstanceObject> instance,
-                                          Handle<String> name,
-                                          Handle<Code> export_wrapper,
-                                          int arity, int func_index);
+                                          MaybeHandle<String> maybe_name,
+                                          int func_index, int arity,
+                                          Handle<Code> export_wrapper);
 };
 
 class WasmCompiledModule : public FixedArray {
  public:
   enum Fields { kFieldCount };
 
   static WasmCompiledModule* cast(Object* fixed_array) {
     SLOW_DCHECK(IsWasmCompiledModule(fixed_array));
     return reinterpret_cast<WasmCompiledModule*>(fixed_array);
   }
@@ skipping 221 matching lines @@
   };
 };
 
 #undef DECLARE_ACCESSORS
 #undef DECLARE_OPTIONAL_ACCESSORS
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_WASM_OBJECTS_H_