[debug] add exception predictions to builtins where missing.

src/builtins/builtins-promise.cc

Index: src/builtins/builtins-promise.cc
diff --git a/src/builtins/builtins-promise.cc b/src/builtins/builtins-promise.cc
index 0d0238d267e48a339b05d68b72461858392c3611..53dc648fb79db922d4d73fa360db8088f22ff58b 100644
--- a/src/builtins/builtins-promise.cc
+++ b/src/builtins/builtins-promise.cc
@@ -746,7 +746,7 @@ void PromiseBuiltinsAssembler::InternalResolvePromise(Node* context,
         Goto(&reject);
 
         Bind(&reject);
-        // Don't cause a debug event as this case is forwarding a rejection
+        // Don't cause a debug event as this case is forwarding a rejection.
         InternalPromiseReject(context, promise, thenable_value, false);
         PromiseSetHasHandler(result);
         Goto(&out);
@@ -829,7 +829,8 @@ void PromiseBuiltinsAssembler::InternalResolvePromise(Node* context,
   // 9.a Return RejectPromise(promise, then.[[Value]]).
   Bind(&if_rejectpromise);
   {
-    InternalPromiseReject(context, promise, var_reason.value(), true);
+    // Don't cause a debug event as this case is forwarding a rejection.
+    InternalPromiseReject(context, promise, var_reason.value(), false);

[Yang, 2017/03/06 11:45:02]

In the test case we break twice, once in the getter where we throw the
exception, and a second time in Promise.resolve itself, where we trigger a
PromiseReject event. The PromiseReject event is redundant.

     Goto(&out);
   }