[es6] More efficient way of marking AST call expressions in tail positions.

test/mjsunit/mjsunit.status

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@@ skipping 27 matching lines @@
   'regress/regress-524': [SKIP],
   # When that bug is fixed, revert the expectation to:
   # Skip long running test in debug and allow it to timeout in release mode.
   # regress/regress-524: [PASS, TIMEOUT, ['mode == debug', SKIP]],
 
   # This test non-deterministically runs out of memory on Windows ia32.
   'regress/regress-crbug-160010': [SKIP],
 
   # Issue 4698: not fully supported by Turbofan yet
   'es6/tail-call-simple': [SKIP],
+  'es6/tail-call': [PASS, NO_VARIANTS],
 
   # Issue 3389: deopt_every_n_garbage_collections is unsafe
   'regress/regress-2653': [SKIP],
 
   # Issue 3784: setters-on-elements is flaky
   'setters-on-elements': [PASS, FAIL],
 
   # Issue 3641: The new 'then' semantics suppress some exceptions.
   # These tests may be changed or removed when 'chain' is deprecated.
   'es6/debug-promises/reject-with-throw-in-reject': [FAIL],
@@ skipping 966 matching lines @@
   # Tests taking too long.
   'array-functions-prototype-misc': [SKIP],
   'strong/implicit-conversions': [SKIP],
   'strong/load-element-mutate-backing-store': [SKIP],
 
   # Stack overflow.
   'big-array-literal': [SKIP],
 }],  # 'gcov_coverage'
 
 ]