[wasm] Introduce instance types for WebAssembly.* objects.

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 61825618e9f7aeb506e5ea48ecfb72070092f648..cf952a37427853774b993b13e0d4053962e70997 100644
--- a/src/wasm/wasm-module.h
+++ b/src/wasm/wasm-module.h
@@ -384,13 +384,6 @@ std::ostream& operator<<(std::ostream& os, const WasmFunctionName& name);
 // If no debug info exists yet, it is created automatically.
 Handle<WasmDebugInfo> GetDebugInfo(Handle<JSObject> wasm);
 
-// Check whether the given object represents a WebAssembly.Instance instance.
-// This checks the number and type of embedder fields, so it's not 100 percent
-// secure. If it turns out that we need more complete checks, we could add a
-// special marker as embedder field, which will definitely never occur anywhere
-// else.
-bool IsWasmInstance(Object* instance);
-
 // Get the script of the wasm module. If the origin of the module is asm.js, the
 // returned Script will be a JavaScript Script of Script::TYPE_NORMAL, otherwise
 // it's of type TYPE_WASM.