[turbofan] Re-enable flaky tests that should no longer flake.

test/mjsunit/mjsunit.status

 # Copyright 2012 the V8 project authors. All rights reserved.
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 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
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@@ skipping 54 matching lines @@
   'unicode-test': [PASS, NO_VARIANTS],
   'whitespaces': [PASS, NO_VARIANTS],
   'ignition/regress-599001-verifyheap': [PASS, NO_VARIANTS],
   'es6/string-fromcodepoint': [PASS, NO_VARIANTS],
   'regress/regress-2612': [PASS, NO_VARIANTS],
 
   # Issue 3660: Replacing activated TurboFan frames by unoptimized code does
   # not work, but we expect it to not crash.
   'debug-step-turbofan': [PASS, FAIL],
 
-  # TODO(mstarzinger): Optimizing top-level code revealed some issues. Fix!
-  'debug-break-inline': [PASS, NO_VARIANTS],  # very flaky.
-  'debug-step': [PASS, NO_VARIANTS],  # windows only.
-  'debug-step-2': [PASS, NO_VARIANTS],  # flaky in no-snap mode.
-  'debug-step-3': [PASS, NO_VARIANTS],  # flaky in no-snap mode.
-  'regress/regress-2451': [PASS, NO_VARIANTS],  # with custom snapshot and gc-stress.
-  'debug-multiple-breakpoints': [PASS, NO_VARIANTS],  # with custom snapshot and gc-stress.
-
   # TODO(jarin/mstarzinger): Investigate debugger issues with TurboFan.
   'debug-evaluate-closure': [PASS, NO_VARIANTS],
   'debug-evaluate-locals': [PASS, NO_VARIANTS],
   'debug-evaluate-locals-capturing': [PASS, NO_VARIANTS],
   'debug-evaluate-locals-optimized': [PASS, NO_VARIANTS],
   'debug-evaluate-locals-optimized-double': [PASS, NO_VARIANTS],
   'debug-evaluate-recursive': [PASS, NO_VARIANTS],  # only in no-snap debug.
   'debug-liveedit-check-stack': [PASS, NO_VARIANTS],  # only in no-snap mode.
   'debug-liveedit-double-call': [PASS, NO_VARIANTS],
   'debug-set-variable-value': [PASS, NO_VARIANTS],
@@ skipping 681 matching lines @@
 ##############################################################################
 ['gcov_coverage', {
   # Tests taking too long.
   'array-functions-prototype-misc': [SKIP],
 
   # Stack overflow.
   'big-array-literal': [SKIP],
 }],  # 'gcov_coverage'
 
 ]