[turbofan] Fix OSR environment in for-in.

src/compiler/ast-graph-builder.cc

Index: src/compiler/ast-graph-builder.cc
diff --git a/src/compiler/ast-graph-builder.cc b/src/compiler/ast-graph-builder.cc
index e45b615888d9647fe0ff9892c35a80d7f32fd679..7322ba0cfda5271febc026bdcb6f4889210f0ffc 100644
--- a/src/compiler/ast-graph-builder.cc
+++ b/src/compiler/ast-graph-builder.cc
@@ -1398,10 +1398,10 @@ void AstGraphBuilder::VisitForInStatement(ForInStatement* stmt) {
         VisitIterationBody(stmt, &for_loop);
       }
       test_value.End();
-      index = environment()->Peek(0);
       for_loop.EndBody();
 
       // Increment counter and continue.
+      index = environment()->Peek(0);
       index = NewNode(javascript()->ForInStep(), index);
       environment()->Poke(0, index);
     }