Allow microtasks to throw exceptions and handle them gracefully

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 304d84ffcf872d6163a19f8a38ce9e7f8df8eaf3..84884be304f2388af10e9cd7778e673940f1356c 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -58,7 +58,7 @@
 namespace v8 {
 
 #define ON_BAILOUT(isolate, location, code)                        \
-  if (IsExecutionTerminatingCheck(isolate)) {                      \
+  if (isolate->IsExecutionTerminating()) {                         \
     code;                                                          \
     UNREACHABLE();                                                 \
   }
@@ -192,16 +192,6 @@ bool V8::IsDead() {
 }
 
 
-static inline bool IsExecutionTerminatingCheck(i::Isolate* isolate) {
-  if (!isolate->IsInitialized()) return false;
-  if (isolate->has_scheduled_exception()) {
-    return isolate->scheduled_exception() ==
-        isolate->heap()->termination_exception();
-  }
-  return false;
-}
-
-
 // --- S t a t i c s ---
 
 
@@ -6478,7 +6468,7 @@ void V8::TerminateExecution(Isolate* isolate) {
 bool V8::IsExecutionTerminating(Isolate* isolate) {
   i::Isolate* i_isolate = isolate != NULL ?
       reinterpret_cast<i::Isolate*>(isolate) : i::Isolate::Current();
-  return IsExecutionTerminatingCheck(i_isolate);
+  return i_isolate->IsExecutionTerminating();
 }