Also print the exception when mksnapshot failed to compile extra code.

src/mksnapshot.cc

Index: src/mksnapshot.cc
diff --git a/src/mksnapshot.cc b/src/mksnapshot.cc
index abfe69397b0998927fd7d2c0a498de38f64780a2..4e34d1875302718be3ca59bb996dc7da50545ac2 100644
--- a/src/mksnapshot.cc
+++ b/src/mksnapshot.cc
@@ -291,6 +291,18 @@ class BZip2Decompressor : public StartupDataDecompressor {
 #endif
 
 
+void DumpException(Handle<Message> message) {
+  String::Utf8Value message_string(message->Get());
+  String::Utf8Value message_line(message->GetSourceLine());
+  fprintf(stderr, "%s at line %d\n", *message_string, message->GetLineNumber());
+  fprintf(stderr, "%s\n", *message_line);
+  for (int i = 0; i <= message->GetEndColumn(); ++i) {
+    fprintf(stderr, "%c", i < message->GetStartColumn() ? ' ' : '^');
+  }
+  fprintf(stderr, "\n");
+}
+
+
 int main(int argc, char** argv) {
   // By default, log code create information in the snapshot.
   i::FLAG_log_code = true;
@@ -350,27 +362,14 @@ int main(int argc, char** argv) {
     TryCatch try_catch;
     Local<Script> script = Script::Compile(source);
     if (try_catch.HasCaught()) {
-      fprintf(stderr, "Failure compiling '%s' (see above)\n", name);
+      fprintf(stderr, "Failure compiling '%s'\n", name);
+      DumpException(try_catch.Message());
       exit(1);
     }
     script->Run();
     if (try_catch.HasCaught()) {
       fprintf(stderr, "Failure running '%s'\n", name);
-      Local<Message> message = try_catch.Message();
-      Local<String> message_string = message->Get();
-      Local<String> message_line = message->GetSourceLine();
-      int len = 2 + message_string->Utf8Length() + message_line->Utf8Length();
-      char* buf = new char(len);
-      message_string->WriteUtf8(buf);
-      fprintf(stderr, "%s at line %d\n", buf, message->GetLineNumber());
-      message_line->WriteUtf8(buf);
-      fprintf(stderr, "%s\n", buf);
-      int from = message->GetStartColumn();
-      int to = message->GetEndColumn();
-      int i;
-      for (i = 0; i < from; i++) fprintf(stderr, " ");
-      for ( ; i <= to; i++) fprintf(stderr, "^");
-      fprintf(stderr, "\n");
+      DumpException(try_catch.Message());
       exit(1);
     }
     context->Exit();