[builtins] Support SameValue and SameValueZero via runtime functions.

test/mjsunit/samevalue.js

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-// Flags: --expose-natives-as natives
+// Flags: --expose-natives-as natives --allow-natives-syntax
 // Test the SameValue and SameValueZero internal methods.
 
 var obj1 = {x: 10, y: 11, z: "test"};
 var obj2 = {x: 10, y: 11, z: "test"};
 
 var sameValue = Object.is;
-var sameValueZero = natives.ImportNow("SameValueZero");
+var sameValueZero = function(x, y) { return %SameValueZero(x, y); }
 
 // Calls SameValue and SameValueZero and checks that their results match.
 function sameValueBoth(a, b) {
   var result = sameValue(a, b);
   assertTrue(result === sameValueZero(a, b));
   return result;
 }
 
 // Calls SameValue and SameValueZero and checks that their results don't match.
 function sameValueZeroOnly(a, b) {
@@ skipping 64 matching lines @@
 assertFalse(sameValueBoth("1", 1));
 assertFalse(sameValueBoth("true", true));
 assertFalse(sameValueBoth("false", false));
 assertFalse(sameValueBoth("undefined", undefined));
 assertFalse(sameValueBoth("NaN", NaN));
 
 // SameValue considers -0 and +0 to be different; SameValueZero considers
 // -0 and +0 to be the same.
 assertTrue(sameValueZeroOnly(+0, -0));
 assertTrue(sameValueZeroOnly(-0, +0));