Revert I+TF for lexical variables

src/ast/ast-numbering.cc

Index: src/ast/ast-numbering.cc
diff --git a/src/ast/ast-numbering.cc b/src/ast/ast-numbering.cc
index 374970775b53a25d6ded57af7ba058d59b6f59e8..25aa9d7a5a71b0c6b6a53721492db61ee77a9fff 100644
--- a/src/ast/ast-numbering.cc
+++ b/src/ast/ast-numbering.cc
@@ -166,12 +166,6 @@ void AstNumberingVisitor::VisitVariableProxyReference(VariableProxy* node) {
     default:
       break;
   }
-  if (node->var()->binding_needs_init()) {
-    // Disable FCG+CS for all variable bindings that need explicit
-    // initialization, i.e. ES2015 style const and let, but not
-    // named function expressions.
-    DisableFullCodegenAndCrankshaft(kReferenceToLetOrConstVariable);
-  }
   node->set_base_id(ReserveIdRange(VariableProxy::num_ids()));
 }