[wasm] Use a Managed<WasmModule> to hold metadata about modules.

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index 4f9e435991090cf87c9c7b98c1934fde9cf0dc0a..ef0feead3ea877e4ce44fca72b4ccdf63a9f635d 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -510,7 +510,7 @@ Handle<Object> Isolate::CaptureSimpleStackTrace(Handle<JSReceiver> error_object,
 
       case StackFrame::WASM: {
         WasmFrame* wasm_frame = WasmFrame::cast(frame);
-        Handle<Object> wasm_object(wasm_frame->wasm_obj(), this);
+        Handle<Object> instance(wasm_frame->wasm_obj(), this);

[Mircea Trofin, 2016/10/19 05:28:55]

I really wish the renames (while super-welcome) came in as a separate CL.

[titzer, 2016/10/19 09:54:41]

Renaming split out to: https://codereview.chromium.org/2428343005/

         const int wasm_function_index = wasm_frame->function_index();
         Code* code = wasm_frame->unchecked_code();
         Handle<AbstractCode> abstract_code(AbstractCode::cast(code), this);
@@ -519,16 +519,15 @@ Handle<Object> Isolate::CaptureSimpleStackTrace(Handle<JSReceiver> error_object,
 
         // TODO(wasm): The wasm object returned by the WasmFrame should always
         //             be a wasm object.
-        DCHECK(wasm::IsWasmObject(*wasm_object) ||
-               wasm_object->IsUndefined(this));
+        DCHECK(wasm::IsWasmInstance(*instance) || instance->IsUndefined(this));
 
-        int flags = wasm::WasmIsAsmJs(*wasm_object, this)
+        int flags = wasm::WasmIsAsmJs(*instance, this)
                         ? FrameArray::kIsAsmJsWasmFrame
                         : FrameArray::kIsWasmFrame;
 
-        elements = FrameArray::AppendWasmFrame(elements, wasm_object,
-                                               wasm_function_index,
-                                               abstract_code, offset, flags);
+        elements =
+            FrameArray::AppendWasmFrame(elements, instance, wasm_function_index,
+                                        abstract_code, offset, flags);
       } break;
 
       default: