Fix isolate bug introduced by generated code stubs

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index e617179fbe5ebef87537c397043c0993d860ee4a..6bbe5eb527744e46a64bb791ee8c194e3683253b 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -1060,9 +1060,8 @@ class Isolate {
     date_cache_ = date_cache;
   }
 
-  CodeStubInterfaceDescriptor** code_stub_interface_descriptors() {
-    return code_stub_interface_descriptors_;
-  }
+  CodeStubInterfaceDescriptor*
+      code_stub_interface_descriptor(int index);
 
   void IterateDeferredHandles(ObjectVisitor* visitor);
   void LinkDeferredHandles(DeferredHandles* deferred_handles);
@@ -1246,7 +1245,7 @@ class Isolate {
   RegExpStack* regexp_stack_;
   DateCache* date_cache_;
   unibrow::Mapping<unibrow::Ecma262Canonicalize> interp_canonicalize_mapping_;
-  CodeStubInterfaceDescriptor** code_stub_interface_descriptors_;
+  CodeStubInterfaceDescriptor* code_stub_interface_descriptors_;
 
   // The garbage collector should be a little more aggressive when it knows
   // that a context was recently exited.