Use HType::NonPrimitive() for unclassified HeapObjects (i.e. Maps).

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index 16efa21fa23059f435d038462883b01697edf23c..ad5faea889593da84592a0cda8a117abe67a8574 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -341,6 +341,8 @@ HType HType::TypeFromValue(Handle<Object> value) {
     result = HType::JSObject();
   } else if (value->IsJSArray()) {
     result = HType::JSArray();
+  } else if (value->IsHeapObject()) {
+    result = HType::NonPrimitive();
   }
   return result;
 }