Remove unused UNARY_MINUS builtin.

src/runtime.js

 // Copyright 2006-2008 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 276 matching lines @@
 
 
 // ECMA-262, section 11.10, page 57.
 function BIT_XOR(y) {
   var x = IS_NUMBER(this) ? this : %NonNumberToNumber(this);
   if (!IS_NUMBER(y)) y = %NonNumberToNumber(y);
   return %NumberXor(x, y);
 }
 
 
-// ECMA-262, section 11.4.7, page 47.
-function UNARY_MINUS() {
-  var x = IS_NUMBER(this) ? this : %NonNumberToNumber(this);
-  return %NumberUnaryMinus(x);
-}
-
-
 // ECMA-262, section 11.4.8, page 48.
 function BIT_NOT() {
   var x = IS_NUMBER(this) ? this : %NonNumberToNumber(this);
   return %NumberNot(x);
 }
 
 
 // ECMA-262, section 11.7.1, page 51.
 function SHL(y) {
   var x = IS_NUMBER(this) ? this : %NonNumberToNumber(this);
@@ skipping 367 matching lines @@
   return i;
 }
 
 
 // NOTE: Setting the prototype for Array must take place as early as
 // possible due to code generation for array literals.  When
 // generating code for a array literal a boilerplate array is created
 // that is cloned when running the code.  It is essential that the
 // boilerplate gets the right prototype.
 %FunctionSetPrototype($Array, new $Array(0));