Allow multiple lines of custom flags in javascript tests.

test/mjsunit/array-literal-transitions.js

 // Copyright 2012 the V8 project authors. All rights reserved.
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 //
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 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --allow-natives-syntax --smi-only-arrays --expose-gc --noparallel-recompilation
+// Flags: --allow-natives-syntax --smi-only-arrays --expose-gc
+// Flags: --noparallel-recompilation
+
 // Test element kind of objects.
 // Since --smi-only-arrays affects builtins, its default setting at compile
 // time sticks if built with snapshot.  If --smi-only-arrays is deactivated
 // by default, only a no-snapshot build actually has smi-only arrays enabled
 // in this test case.  Depending on whether smi-only arrays are actually
 // enabled, this test takes the appropriate code path to check smi-only arrays.
 
 support_smi_only_arrays = %HasFastSmiElements([1,2,3,4,5,6,7,8,9,10]);
 
 if (support_smi_only_arrays) {
@@ skipping 162 matching lines @@
   assertEquals(1, array[1]);
   assertEquals(foo, array[2]);
 }
 
 (function literals_after_osr() {
   var color = [0];
   // Trigger OSR.
   while (%GetOptimizationStatus(literals_after_osr) == 2) {}
   return [color[0]];
 })();