ARM: Improve SeqStringSetChar implementation.

test/mjsunit/lithium/SeqStringSetChar.js

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 // Flags: --allow-natives-syntax
 
-function TestNonSmiArrayLength() {
-  function f(a) {
-    return a.length+1;
-  }
-
-  var a = [];
-  a.length = 0xFFFF;
-  assertSame(0x10000, f(a));
-  assertSame(0x10000, f(a));
-
-  %OptimizeFunctionOnNextCall(f);
-  a.length = 0xFFFFFFFF;
-  assertSame(0x100000000, f(a));
+function MyStringFromCharCode(code, i) {
+  var one_byte = %NewString(3, true);
+  %_OneByteSeqStringSetChar(one_byte, 0, code);
+  %_OneByteSeqStringSetChar(one_byte, 1, code);
+  %_OneByteSeqStringSetChar(one_byte, i, code);
+  var two_byte = %NewString(3, false);
+  %_TwoByteSeqStringSetChar(two_byte, 0, code);
+  %_TwoByteSeqStringSetChar(two_byte, 1, code);
+  %_TwoByteSeqStringSetChar(two_byte, i, code);
+  return one_byte + two_byte;
 }
 
-TestNonSmiArrayLength();
-
+MyStringFromCharCode(65, 2);
+var r1 = MyStringFromCharCode(65, 2);
+%OptimizeFunctionOnNextCall(MyStringFromCharCode);
+var r2 = MyStringFromCharCode(65, 2);
+assertEquals(r1, r2);