Simple heap trimming.

Change-Id: I8a94b637e64c6b5586db3c41b6e9230e7c8250c8
diff --git a/src/runtime.cc b/src/runtime.cc
index 306bb87..60e875b 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -553,6 +553,7 @@
   jmethodID mid = env->GetStaticMethodID(c.get(), "start", "()V");
   CHECK(mid != NULL);
   env->CallStaticVoidMethod(c.get(), mid);
+  CHECK(!env->ExceptionCheck());
 
   VLOG(startup) << "Runtime::StartDaemonThreads exiting";
 }