Rewrite decodeURL as builtin function, remove now unused runtime functions.

test/mjsunit/regress/regress-seqstrsetchar-ex1.js

-// Copyright 2013 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
-//       with the distribution.
-//     * Neither the name of Google Inc. nor the names of its
-//       contributors may be used to endorse or promote products derived
-//       from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Flags: --allow-natives-syntax
-
-// stubbed version of ToNumber
-function ToNumber(x) {
-  return 311;
-}
-
-// Reduced version of String.fromCharCode;
-// does not actually do the same calculation but exhibits untagging bug.
-function StringFromCharCode(code) {
-  var n = arguments.length;
-  var one_byte = %NewString(n, true);
-  var i;
-  for (i = 0; i < n; i++) {
-    var code = arguments[i];
-    if (!%_IsSmi(code)) code = ToNumber(code) & 0xffff;
-    if (code > 0xff) break;
-  }
-
-  var two_byte = %NewString(n - i, false);
-  for (var j = 0; i < n; i++, j++) {
-    var code = arguments[i];
-    %_TwoByteSeqStringSetChar(j, code, two_byte);
-  }
-  return one_byte + two_byte;
-}
-
-StringFromCharCode(0xFFF, 0xFFF);
-StringFromCharCode(0x7C, 0x7C);
-%OptimizeFunctionOnNextCall(StringFromCharCode);
-StringFromCharCode(0x7C, 0x7C);
-StringFromCharCode(0xFFF, 0xFFF);