[wasm] Use handles in wasm::GetDebugInfo.

src/frames.cc

Index: src/frames.cc
diff --git a/src/frames.cc b/src/frames.cc
index fbce95bec0a7f9938bf9c6b356357cb23fe1863c..d14646989ebfb71161bccd93a67a2ae53e742d1f 100644
--- a/src/frames.cc
+++ b/src/frames.cc
@@ -1434,8 +1434,8 @@ uint32_t WasmFrame::function_index() const {
 }
 
 Script* WasmFrame::script() const {

[Michael Starzinger, 2016/07/08 08:05:07]

If {wasm::GetDebugInfo} can really trigger a GC then we will need to rework the
frame-walker to handlify this virtual method as well.

-  JSObject* wasm = JSObject::cast(wasm_obj());
-  Handle<wasm::WasmDebugInfo> debug_info(wasm::GetDebugInfo(wasm), isolate());
+  Handle<JSObject> wasm(JSObject::cast(wasm_obj()), isolate());
+  Handle<wasm::WasmDebugInfo> debug_info = wasm::GetDebugInfo(wasm);
   return wasm::WasmDebugInfo::GetFunctionScript(debug_info, function_index());
 }