Constant-fold !<number>

src/parser.cc

Index: src/parser.cc
===================================================================
--- src/parser.cc	(revision 8307)
+++ src/parser.cc	(working copy)
@@ -2556,6 +2556,11 @@
           return NewNumberLiteral(-value);
         case Token::BIT_NOT:
           return NewNumberLiteral(~DoubleToInt32(value));
+        case Token::NOT: {
+          bool bool_value = isnan(value) ? true : (value == 0);
+          Handle<Object> boolean(isolate()->heap()->ToBoolean(bool_value));
+          return new(zone()) Literal(boolean);
+        }
         default: break;
       }
     }