Introduce basic type feedback for for-in statements to avoid deopts.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 33fa0f4806a556e5f33c8f8735d7b56eb2f2c556..3124817b1d886b0022d8a98e254bfe4ab63b27a8 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -3274,6 +3274,10 @@ void HGraphBuilder::VisitForInStatement(ForInStatement* stmt) {
     return Bailout("ForInStatement optimization is disabled");
   }
 
+  if (!oracle()->IsForInFastCase(stmt)) {
+    return Bailout("ForInStatement is not fast case");
+  }
+
   if (!stmt->each()->IsVariableProxy() ||
       !stmt->each()->AsVariableProxy()->var()->IsStackLocal()) {
     return Bailout("ForInStatement with non-local each variable");