[wasm] Fix for 608630: allow proxies as FFI.

src/wasm/wasm-module.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_MODULE_H_
 #define V8_WASM_MODULE_H_
 
 #include "src/wasm/wasm-opcodes.h"
 #include "src/wasm/wasm-result.h"
 
@@ skipping 203 matching lines @@
     return GetNameOrNull(function->name_offset, function->name_length);
   }
 
   // Checks the given offset range is contained within the module bytes.
   bool BoundsCheck(uint32_t start, uint32_t end) const {
     size_t size = module_end - module_start;
     return start <= size && end <= size;
   }
 
   // Creates a new instantiation of the module in the given isolate.
-  MaybeHandle<JSObject> Instantiate(Isolate* isolate, Handle<JSObject> ffi,
+  MaybeHandle<JSObject> Instantiate(Isolate* isolate, Handle<JSReceiver> ffi,
                                     Handle<JSArrayBuffer> memory);
 };
 
 // An instantiated WASM module, including memory, function table, etc.
 struct WasmModuleInstance {
   WasmModule* module;  // static representation of the module.
   // -- Heap allocated --------------------------------------------------------
   Handle<JSObject> js_object;            // JavaScript module object.
   Handle<Context> context;               // JavaScript native context.
   Handle<JSArrayBuffer> mem_buffer;      // Handle to array buffer of memory.
@@ skipping 99 matching lines @@
 // Extract a function name from the given wasm object.
 // Returns undefined if the function is unnamed or the function index is
 // invalid.
 Handle<Object> GetWasmFunctionName(Handle<JSObject> wasm, uint32_t func_index);
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_WASM_MODULE_H_