VM: Remove non-existent/unused functions from precompiled entry points.

runtime/vm/exceptions.cc

Index: runtime/vm/exceptions.cc
diff --git a/runtime/vm/exceptions.cc b/runtime/vm/exceptions.cc
index 82bc54433fbb3a0e622ad300057fff4fa7903b7f..99563bb3d07387c1a577b4e3a47cc668214222ad 100644
--- a/runtime/vm/exceptions.cc
+++ b/runtime/vm/exceptions.cc
@@ -624,10 +624,6 @@ RawObject* Exceptions::Create(ExceptionType type, const Array& arguments) {
       library = Library::IsolateLibrary();
       class_name = &Symbols::IsolateSpawnException();
       break;
-    case kIsolateUnhandledException:
-      library = Library::IsolateLibrary();
-      class_name = &Symbols::IsolateUnhandledException();
-      break;
     case kJavascriptIntegerOverflowError:
       library = Library::CoreLibrary();
       class_name = &Symbols::JavascriptIntegerOverflowError();