Adjust some tests to prepare enabling Ignition+TurboFan

test/mjsunit/string-externalize.js

 // Copyright 2010 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
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 //
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 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --expose-externalize-string --expose-gc
+// Flags: --expose-externalize-string --expose-gc --allow-natives-syntax
 
 var size = 1024;
 
+function dont_inline() { return "A"; }
+%NeverOptimizeFunction(dont_inline);
+
+function dont_inline2() { return "\u1234"; }
+%NeverOptimizeFunction(dont_inline2);
+
 function test() {
   var str = "";
 
   // Build an ascii cons string.
   for (var i = 0; i < size; i++) {
       str += String.fromCharCode(i & 0x7f);
   }
   assertTrue(isOneByteString(str));
 
   var twoByteExternalWithOneByteData =
-      "AA" + (function() { return "A"; })();
+      "AA" + dont_inline();
   externalizeString(twoByteExternalWithOneByteData, true /* force two-byte */);
   assertFalse(isOneByteString(twoByteExternalWithOneByteData));
 
   var realTwoByteExternalString =
-      "\u1234\u1234\u1234\u1234" + (function() { return "\u1234"; })();
+      "\u1234\u1234\u1234\u1234" + dont_inline2();
   externalizeString(realTwoByteExternalString);
   assertFalse(isOneByteString(realTwoByteExternalString));
 
   assertTrue(isOneByteString(["a", twoByteExternalWithOneByteData].join("")));
 
   // Appending a two-byte string that contains only ascii chars should
   // still produce an ascii cons.
   var str1 = str + twoByteExternalWithOneByteData;
   assertTrue(isOneByteString(str1));
 
@@ skipping 32 matching lines @@
 }
 
 // Run the test many times to ensure IC-s don't break things.
 for (var i = 0; i < 10; i++) {
   test();
 }
 
 // Clean up string to make Valgrind happy.
 gc();
 gc();