Add void operator to fast compiler.

src/compiler.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 807 matching lines @@
   }
   // Check all arguments to the call.  (Relies on TEMP meaning STACK.)
   for (int i = 0; i < expr->arguments()->length(); i++) {
     ProcessExpression(expr->arguments()->at(i), Expression::kValue);
     CHECK_BAILOUT;
   }
 }
 
 
 void CodeGenSelector::VisitUnaryOperation(UnaryOperation* expr) {
-  BAILOUT("UnaryOperation");
+  switch (expr->op()) {
+    case Token::VOID:
+      ProcessExpression(expr->expression(), Expression::kEffect);
+      break;
+    default:
+      BAILOUT("UnaryOperation");
+  }
 }
 
 
 void CodeGenSelector::VisitCountOperation(CountOperation* expr) {
   BAILOUT("CountOperation");
 }
 
 
 void CodeGenSelector::VisitBinaryOperation(BinaryOperation* expr) {
   switch (expr->op()) {
@@ skipping 38 matching lines @@
 
 void CodeGenSelector::VisitThisFunction(ThisFunction* expr) {
   BAILOUT("ThisFunction");
 }
 
 #undef BAILOUT
 #undef CHECK_BAILOUT
 
 
 } }  // namespace v8::internal