ARM: Improve SeqStringSetChar implementation.

test/mjsunit/lithium/SeqStringSetChar.js

Index: test/mjsunit/lithium/SeqStringSetChar.js
diff --git a/test/mjsunit/array-non-smi-length.js b/test/mjsunit/lithium/SeqStringSetChar.js
similarity index 72%
copy from test/mjsunit/array-non-smi-length.js
copy to test/mjsunit/lithium/SeqStringSetChar.js
index 23a25ee797bd68690ad2a7ce26a9135e23b486e2..3c890a84897f0014f79f07ef624daf8c3bf825a4 100644
--- a/test/mjsunit/array-non-smi-length.js
+++ b/test/mjsunit/lithium/SeqStringSetChar.js
@@ -27,20 +27,20 @@
 
 // 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);