[builtins] Fix String.prototype.indexOf with negative positions

test/mjsunit/string-indexof-1.js

 // Copyright 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 12 matching lines @@
 // 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.
 
 var s = "test test test";
 
 assertEquals(0, s.indexOf("t"));
 assertEquals(3, s.indexOf("t", 1));
 assertEquals(5, s.indexOf("t", 4));
+assertEquals(5, s.indexOf("t", 4.1));
+assertEquals(0, s.indexOf("t", 0));
+assertEquals(0, s.indexOf("t", -1));
+assertEquals(0, s.indexOf("t", -1));
+assertEquals(0, s.indexOf("t", -1.1));
+assertEquals(0, s.indexOf("t", -1073741825));
 assertEquals(1, s.indexOf("e"));
 assertEquals(2, s.indexOf("s"));
 
 assertEquals(5, s.indexOf("test", 4));
 assertEquals(5, s.indexOf("test", 5));
 assertEquals(10, s.indexOf("test", 6));
+assertEquals(10, s.indexOf("test", 6.0));
 assertEquals(0, s.indexOf("test", 0));
+assertEquals(0, s.indexOf("test", 0.0));
 assertEquals(0, s.indexOf("test", -1));
+assertEquals(-1, s.indexOf("not found", -1));
+assertEquals(0, s.indexOf("test", -1.0));
+assertEquals(0, s.indexOf("test", -1073741825));
 assertEquals(0, s.indexOf("test"));
 assertEquals(-1, s.indexOf("notpresent"));
 assertEquals(-1, s.indexOf());
 
 for (var i = 0; i < s.length+10; i++) {
   var expected = i < s.length ? i : s.length;
   assertEquals(expected, s.indexOf("", i));
 }
 
 var reString = "asdf[a-z]+(asdf)?";
@@ skipping 136 matching lines @@
 })();
 
 (function nonStringPosition() {
   assertEquals(0, "aba".indexOf("a", false));
   assertEquals(2, "aba".indexOf("a", true));
   assertEquals(2, "aba".indexOf("a", "1"));
   assertEquals(2, "aba".indexOf("a", "1.00000"));
   assertEquals(2, "aba".indexOf("a", "2.00000"));
   assertEquals(-1, "aba".indexOf("a", "3.00000"));
 })();