Allow multiple lines of custom flags in javascript tests.

test/mjsunit/elements-transition-hoisting.js

 // Copyright 2012 the V8 project authors. All rights reserved.
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-// Flags: --allow-natives-syntax --smi-only-arrays --expose-gc --noparallel-recompilation
+// Flags: --allow-natives-syntax --smi-only-arrays --expose-gc
+// Flags: --noparallel-recompilation
 
 // Ensure that ElementsKind transitions in various situations are hoisted (or
 // not hoisted) correctly, don't change the semantics programs and don't trigger
 // deopt through hoisting in important situations.
 
 support_smi_only_arrays = %HasFastSmiElements(new Array(1,2,3,4,5,6));
 
 if (support_smi_only_arrays) {
   print("Tests include smi-only arrays.");
 } else {
@@ skipping 183 matching lines @@
   testStraightLineDupeElinination(new Array(5),.5,0,0,0,0);
   testStraightLineDupeElinination(new Array(5),0,.5,0,0,0);
   testStraightLineDupeElinination(new Array(5),0,0,.5,0,0);
   testStraightLineDupeElinination(new Array(5),0,0,0,.5,0);
   testStraightLineDupeElinination(new Array(5),0,0,0,0,.5);
   %OptimizeFunctionOnNextCall(testStraightLineDupeElinination);
   testStraightLineDupeElinination(new Array(5));
   testStraightLineDupeElinination(new Array(5));
   assertTrue(2 != %GetOptimizationStatus(testStraightLineDupeElinination));
 }