Ensure mjsunit tests use dashes not underscores in flags directives.

test/mjsunit/elements-kind.js

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-// Flags: --allow-natives-syntax --expose-gc --nostress-opt --typed-array-max_size_in-heap=2048
+// Flags: --allow-natives-syntax --expose-gc --nostress-opt --typed-array-max-size-in-heap=2048
 
 var elements_kind = {
   fast_smi_only             :  'fast smi only elements',
   fast                      :  'fast elements',
   fast_double               :  'fast double elements',
   dictionary                :  'dictionary elements',
   external_int32            :  'external int8 elements',
   external_uint8            :  'external uint8 elements',
   external_int16            :  'external int16 elements',
   external_uint16           :  'external uint16 elements',
@@ skipping 338 matching lines @@
 // Test that Array.splice() and Array.slice() return correct ElementsKinds.
 var a = ["foo", "bar"];
 assertKind(elements_kind.fast, a);
 var b = a.splice(0, 1);
 assertKind(elements_kind.fast, b);
 var c = a.slice(0, 1);
 assertKind(elements_kind.fast, c);
 
 // Throw away type information in the ICs for next stress run.
 gc();