Reapply "- Use a hash table to canonicalize instances/arrays to avoid having to iterate over a line…

runtime/lib/integers.cc

Index: runtime/lib/integers.cc
diff --git a/runtime/lib/integers.cc b/runtime/lib/integers.cc
index e75ecab7787a873a7bf2fc5f970a896cf4b2fd0c..3874ae5ad9f1c51f4b2ac0ec59f571e32aa7489f 100644
--- a/runtime/lib/integers.cc
+++ b/runtime/lib/integers.cc
@@ -244,7 +244,7 @@ DEFINE_NATIVE_ENTRY(Integer_fromEnvironment, 3) {
       if (result.IsSmi()) {
         return result.raw();
       }
-      return result.CheckAndCanonicalize(NULL);
+      return result.CheckAndCanonicalize(thread, NULL);
     }
   }
   return default_value.raw();