More cleanups in compiler (remove allocation in new space).

runtime/vm/growable_array.h

Index: runtime/vm/growable_array.h
diff --git a/runtime/vm/growable_array.h b/runtime/vm/growable_array.h
index 88163fbb1f5ab5b1a424be5d63f3fc996d419250..9023948c605d500229b97a8f59ed45bc9e805741 100644
--- a/runtime/vm/growable_array.h
+++ b/runtime/vm/growable_array.h
@@ -215,6 +215,10 @@ class BaseGrowableHandlePtrArray : public B {
     return operator[](index);
   }
 
+  void SetAt(intptr_t index, const T& t) {
+    array_[index] = &T::ZoneHandle(zone_, t.raw());
+  }
+
   intptr_t length() const { return array_.length(); }
 
   const GrowableArray<T*>& growable_array() const { return array_; }