Add option to print all exceptions

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index a15b1cf345ee00f6740e7e412aee7a745359ffa1..4dc70bff4c0a37f0f04ac7db0d62ecc9cb4c7b14 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -1070,6 +1070,15 @@ Object* Isolate::Throw(Object* exception, MessageLocation* location) {
   HandleScope scope(this);
   Handle<Object> exception_handle(exception, this);
 
+  if (FLAG_print_all_exceptions) {
+    printf("=========================================================\n");
+    printf("Exception thrown:\n");
+    exception->Print();
+    printf("Stack Trace:\n");
+    PrintStack(stdout);
+    printf("=========================================================\n");
+  }
+
   // Determine whether a message needs to be created for the given exception
   // depending on the following criteria:
   // 1) External v8::TryCatch missing: Always create a message because any