Change the order of arguments of the (One|Two)ByteSeqStringSetChar intrinsic.

test/mjsunit/regress/regress-crbug-320922.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
@@ 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.
 
 // Flags: --allow-natives-syntax
 
 var string = "hello world";
 var expected = "Hello " + "world";
 function Capitalize() {
-  %_OneByteSeqStringSetChar(string, 0, 0x48);
+  %_OneByteSeqStringSetChar(0, 0x48, string);
 }
 Capitalize();
 assertEquals(expected, string);
 Capitalize();
 assertEquals(expected, string);
 
 var twobyte = "\u20ACello world";
 
 function TwoByteCapitalize() {
-  %_TwoByteSeqStringSetChar(twobyte, 0, 0x48);
+  %_TwoByteSeqStringSetChar(0, 0x48, twobyte);
 }
 TwoByteCapitalize();
 assertEquals(expected, twobyte);
 TwoByteCapitalize();
 assertEquals(expected, twobyte);