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

src/wasm/wasm-module.h

Index: src/wasm/wasm-module.h
diff --git a/src/wasm/wasm-module.h b/src/wasm/wasm-module.h
index 4092958367b76a641c888fcdc02ed95b07cfc68c..6fe5f18a656e1e5c675476f3b24e18b2e89858c3 100644
--- a/src/wasm/wasm-module.h
+++ b/src/wasm/wasm-module.h
@@ -36,6 +36,11 @@ const uint32_t kWasmVersion = 0x0d;
 const uint8_t kWasmFunctionTypeForm = 0x60;
 const uint8_t kWasmAnyFunctionTypeForm = 0x70;
 
+const uint64_t kWasmMaxHeapOffset =
+    static_cast<uint64_t>(
+        std::numeric_limits<uint32_t>::max())  // maximum base value
+    + std::numeric_limits<uint32_t>::max();    // maximum index value
+
 enum WasmSectionCode {
   kUnknownSectionCode = 0,   // code for unknown sections
   kTypeSectionCode = 1,      // Function signature declarations
@@ -561,6 +566,9 @@ int32_t GetInstanceMemorySize(Isolate* isolate, Handle<JSObject> instance);
 int32_t GrowInstanceMemory(Isolate* isolate, Handle<JSObject> instance,
                            uint32_t pages);
 
+Handle<JSArrayBuffer> NewArrayBuffer(Isolate* isolate, size_t size,
+                                     bool enable_guard_regions);
+
 void UpdateDispatchTables(Isolate* isolate, Handle<FixedArray> dispatch_tables,
                           int index, Handle<JSFunction> js_function);