[wasm] Add guard regions to end of WebAssembly.Memory buffers

src/wasm/wasm-js.cc

 // 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.
 
 #include "src/api-natives.h"
 #include "src/api.h"
 #include "src/asmjs/asm-js.h"
 #include "src/asmjs/asm-typer.h"
 #include "src/asmjs/asm-wasm-builder.h"
 #include "src/assert-scope.h"
@@ skipping 350 matching lines @@
     // There has been an exception, just return.
     return;
   }
   if (has_maximum.FromJust()) {
     if (!GetIntegerProperty(isolate, &thrower, context, descriptor, maximum_key,
                             &maximum, initial, 65536)) {
       return;
     }
   }
   i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
-  i::Handle<i::JSArrayBuffer> buffer =
-      i_isolate->factory()->NewJSArrayBuffer(i::SharedFlag::kNotShared);
   size_t size = static_cast<size_t>(i::wasm::WasmModule::kPageSize) *
                 static_cast<size_t>(initial);
-  i::JSArrayBuffer::SetupAllocatingData(buffer, i_isolate, size);
+  i::Handle<i::JSArrayBuffer> buffer =
+      i::wasm::NewArrayBuffer(i_isolate, size, i::FLAG_wasm_guard_pages);
 
   i::Handle<i::JSObject> memory_obj = i::WasmJs::CreateWasmMemoryObject(
       i_isolate, buffer, has_maximum.FromJust(), maximum);
   v8::ReturnValue<v8::Value> return_value = args.GetReturnValue();
   return_value.Set(Utils::ToLocal(memory_obj));
 }
 
 void WebAssemblyTableGetLength(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
   v8::Isolate* isolate = args.GetIsolate();
@@ skipping 535 matching lines @@
   if (!memory_object->IsUndefined(isolate)) {
     DCHECK(IsWasmMemoryObject(isolate, memory_object));
     // TODO(gdeepti): This should be a weak list of instance objects
     // for instances that share memory.
     JSObject::cast(*memory_object)
         ->SetInternalField(kWasmMemoryInstanceObject, *instance);
   }
 }
 }  // namespace internal
 }  // namespace v8