new classes: special construct stub for derived classs and TDZ for `this`.

src/ia32/full-codegen-ia32.cc

Index: src/ia32/full-codegen-ia32.cc
diff --git a/src/ia32/full-codegen-ia32.cc b/src/ia32/full-codegen-ia32.cc
index b4195350cbb4641f21c07225681efab25d5e89d9..5bd3c1d7efc400dbc04d72dd5c00ca5639d2a0fa 100644
--- a/src/ia32/full-codegen-ia32.cc
+++ b/src/ia32/full-codegen-ia32.cc
@@ -1460,6 +1460,9 @@ void FullCodeGenerator::EmitVariableLoad(VariableProxy* proxy) {
         bool skip_init_check;
         if (var->scope()->DeclarationScope() != scope()->DeclarationScope()) {
           skip_init_check = false;
+        } else if (var->is_this()) {
+          // TODO(dslomov): implement 'this' hole check elimination.
+          skip_init_check = false;
         } else {
           // Check that we always have valid source position.
           DCHECK(var->initializer_position() != RelocInfo::kNoPosition);
@@ -3174,7 +3177,7 @@ void FullCodeGenerator::EmitSuperConstructorCall(Call* expr) {
   RecordJSReturnSite(expr);
 
   // TODO(dslomov): implement TDZ for `this`.
-  EmitVariableAssignment(super_ref->this_var()->var(), Token::ASSIGN);
+  EmitVariableAssignment(super_ref->this_var()->var(), Token::INIT_CONST);
   context()->Plug(eax);
 }