Remove --harmony-modules flag and let embedder decide when modules are used

test/mjsunit/mjsunit.status

Index: test/mjsunit/mjsunit.status
diff --git a/test/mjsunit/mjsunit.status b/test/mjsunit/mjsunit.status
index a147ae22c231957b9f35bcec294be3b4ed8fc0ac..5cb5666e1ee5aaff9c47d957a2921eaf55bef8fc 100644
--- a/test/mjsunit/mjsunit.status
+++ b/test/mjsunit/mjsunit.status
@@ -83,12 +83,6 @@
   'regress/regress-2185-2': [PASS, NO_VARIANTS],
   'regress/regress-2612': [PASS, NO_VARIANTS],
 
-  # Modules are busted
-  'harmony/module-linking': [SKIP],
-  'harmony/module-recompile': [SKIP],
-  'harmony/module-resolution': [SKIP],
-  'harmony/regress/regress-343928': [SKIP],
-
   # Issue 3660: Replacing activated TurboFan frames by unoptimized code does
   # not work, but we expect it to not crash.
   'debug-step-turbofan': [PASS, FAIL],