CallInterfaceDescriptor should use MachineType

src/isolate.h

Index: src/isolate.h
diff --git a/src/isolate.h b/src/isolate.h
index f629b33741983c6cf8e7f305b5dca53beb9fb7f8..e624f1456e119edf7a143fcd9ffd3f3506af625c 100644
--- a/src/isolate.h
+++ b/src/isolate.h
@@ -889,7 +889,6 @@ class Isolate {
     return handle_scope_implementer_;
   }
   Zone* runtime_zone() { return runtime_zone_; }
-  Zone* interface_descriptor_zone() { return interface_descriptor_zone_; }
 
   UnicodeCache* unicode_cache() {
     return unicode_cache_;
@@ -1328,7 +1327,6 @@ class Isolate {
   UnicodeCache* unicode_cache_;
   base::AccountingAllocator* allocator_;
   Zone* runtime_zone_;
-  Zone* interface_descriptor_zone_;
   InnerPointerToCodeCache* inner_pointer_to_code_cache_;
   GlobalHandles* global_handles_;
   EternalHandles* eternal_handles_;