[wasm] asm.js - Check stdlib.NaN is valid, prepare for the rest.

src/asmjs/asm-js.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_ASMJS_ASM_JS_H_
 #define V8_ASMJS_ASM_JS_H_
 
 #ifndef V8_SHARED
 #include "src/allocation.h"
 #include "src/base/hashmap.h"
 #else
 #include "include/v8.h"
 #include "src/base/compiler-specific.h"
 #endif  // !V8_SHARED
 #include "src/parsing/parser.h"
 
 namespace v8 {
 namespace internal {
 // Interface to compile and instantiate for asmjs.
 class AsmJs {
  public:
   static MaybeHandle<FixedArray> ConvertAsmToWasm(i::ParseInfo* info);
+  static bool IsStdlibValid(i::Isolate* isolate, Handle<FixedArray> wasm_data,
+                            Handle<JSReceiver> stdlib);
   static MaybeHandle<Object> InstantiateAsmWasm(i::Isolate* isolate,
                                                 Handle<FixedArray> wasm_data,
                                                 Handle<JSArrayBuffer> memory,
-                                                Handle<JSObject> foreign);
+                                                Handle<JSReceiver> foreign);
 };
 
 }  // namespace internal
 }  // namespace v8
 #endif