[WASM] Implements catch for the wasm low level exception mechanism.

src/isolate-inl.h

Index: src/isolate-inl.h
diff --git a/src/isolate-inl.h b/src/isolate-inl.h
index ed246be75cd6cf54c3b86f0ded95b86cb73c48cf..34c98bba645a5a44253689b954abc9370b550209 100644
--- a/src/isolate-inl.h
+++ b/src/isolate-inl.h
@@ -76,6 +76,11 @@ bool Isolate::is_catchable_by_javascript(Object* exception) {
   return exception != heap()->termination_exception();
 }
 
+bool Isolate::is_catchable_by_wasm(Object* exception) {
+  return is_catchable_by_javascript(exception) &&
+         (exception->IsNumber() || exception->IsSmi());
+}
+
 void Isolate::FireBeforeCallEnteredCallback() {
   for (int i = 0; i < before_call_entered_callbacks_.length(); i++) {
     before_call_entered_callbacks_.at(i)(reinterpret_cast<v8::Isolate*>(this));