Adjust some tests to prepare enabling Ignition+TurboFan

test/mjsunit/string-externalize.js

Index: test/mjsunit/string-externalize.js
diff --git a/test/mjsunit/string-externalize.js b/test/mjsunit/string-externalize.js
index 39cc124914cdece4cbc9b30f0bed66a78cc46e82..dd861e8816366e4f4377aced1ad716c6c5ff5d53 100644
--- a/test/mjsunit/string-externalize.js
+++ b/test/mjsunit/string-externalize.js
@@ -25,10 +25,16 @@
 // (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: --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 = "";
 
@@ -39,12 +45,12 @@ function test() {
   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));