Fix assertion broken by recent revision.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index a03c55d7f3debdbdf64d3cc0c3db5d5811569678..04bc986ff30590911526b4b9aa805413befa429c 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -4353,7 +4353,7 @@ class HToFastProperties: public HUnaryOperation {
     // This instruction is not marked as having side effects, but
     // changes the map of the input operand. Use it only when creating
     // object literals.
-    ASSERT(value->IsObjectLiteralGeneric());
+    ASSERT(value->IsObjectLiteralGeneric() || value->IsObjectLiteralFast());
     set_representation(Representation::Tagged());
   }