Clean up dead code after spread desugaring

src/crankshaft/typing.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/crankshaft/typing.h"
 
 #include "src/ast/scopes.h"
 #include "src/frames.h"
 #include "src/frames-inl.h"
 #include "src/ostreams.h"
@@ skipping 734 matching lines @@
   NarrowLowerType(expr->right(), right_type);
   expr->set_combined_type(combined_type);
 
   RECURSE(Visit(expr->left()));
   RECURSE(Visit(expr->right()));
 
   NarrowType(expr, Bounds(Type::Boolean(zone())));
 }
 
 
-void AstTyper::VisitSpread(Spread* expr) { RECURSE(Visit(expr->expression())); }
+void AstTyper::VisitSpread(Spread* expr) { UNREACHABLE(); }
 
 
 void AstTyper::VisitEmptyParentheses(EmptyParentheses* expr) {
   UNREACHABLE();
 }
 
 
-void AstTyper::VisitThisFunction(ThisFunction* expr) {
-}
+void AstTyper::VisitThisFunction(ThisFunction* expr) {}
 
 
 void AstTyper::VisitSuperPropertyReference(SuperPropertyReference* expr) {}
 
 
 void AstTyper::VisitSuperCallReference(SuperCallReference* expr) {}
 
 
 void AstTyper::VisitRewritableAssignmentExpression(
     RewritableAssignmentExpression* expr) {
@@ skipping 21 matching lines @@
 void AstTyper::VisitImportDeclaration(ImportDeclaration* declaration) {
 }
 
 
 void AstTyper::VisitExportDeclaration(ExportDeclaration* declaration) {
 }
 
 
 }  // namespace internal
 }  // namespace v8