Fix bugs in generating and printing of Crankshaft stubs

src/heap.h

Index: src/heap.h
diff --git a/src/heap.h b/src/heap.h
index 67152c0c8df040468d03f5df9ab1f6cd6f618266..c6c841bf0312d062a83cd47c68375b43d50df44b 100644
--- a/src/heap.h
+++ b/src/heap.h
@@ -480,6 +480,10 @@ class Heap {
                      intptr_t max_executable_size);
   bool ConfigureHeapDefault();
 
+  // Prepares the heap to be initialized, setting up memory areas that are
+  // needed in the isolate without doing the full heap setup.
+  bool Prepare();
+
   // Initializes the global object heap. If create_heap_objects is true,
   // also creates the basic non-mutable objects.
   // Returns whether it succeeded.