Prevent representation inference from double-visiting.

src/hydrogen-infer-representation.cc

Index: src/hydrogen-infer-representation.cc
diff --git a/src/hydrogen-infer-representation.cc b/src/hydrogen-infer-representation.cc
index 1b3ab6ffbb2d814b31c65fded335c0ba7c429892..f61649a68f43880bdbc697778780dafec9f4571c 100644
--- a/src/hydrogen-infer-representation.cc
+++ b/src/hydrogen-infer-representation.cc
@@ -152,8 +152,8 @@ void HInferRepresentationPhase::Run() {
   // Do a fixed point iteration, trying to improve representations
   while (!worklist_.is_empty()) {
     HValue* current = worklist_.RemoveLast();
-    in_worklist_.Remove(current->id());
     current->InferRepresentation(this);
+    in_worklist_.Remove(current->id());
   }
 
   // Lastly: any instruction that we don't have representation information