Inline String.fromCharCode in hydrogen.

test/mjsunit/string-fromcharcode.js

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+// Flags: --allow-natives-syntax
+
 // Test String.fromCharCode.
 
+// Test char codes larger than 0xffff.
+var expected = "";
+for (var i = 100; i < 500; i++) {
+  expected += String.fromCharCode(i);
+}
+
+function testCharCodeTruncation() {
+  var result = "";
+  for (var i = 0x100000 + 100; i < 0x100000 + 500; i++) {
+    result += String.fromCharCode(i);
+  }
+  return result;
+}
+
+assertEquals(expected, testCharCodeTruncation());
+assertEquals(expected, testCharCodeTruncation());
+%OptimizeFunctionOnNextCall(testCharCodeTruncation);
+assertEquals(expected, testCharCodeTruncation());
 
 // Test various receivers and arguments passed to String.fromCharCode.
 
 Object.prototype.fromCharCode = function(x) { return this; };
 
 var fcc = String.fromCharCode;
 var fcc2 = fcc;
 
 function constFun(x) { return function(y) { return x; }; }
 
@@ skipping 42 matching lines @@
   test(i);
 }
 
 
 // Test the custom IC works correctly when the map changes.
 for (var i = 0; i < 10; i++) {
   var expected = (i < 5) ? " " : 42;
   if (i == 5) String.fromCharCode = function() { return 42; };
   assertEquals(expected, String.fromCharCode(0x20));
 }