Enable flaky test that was fixed some time ago

test/cctest/cctest.status

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 prefix cctest
 
-# BUG(96): Fix this flaky test.
-test-debug/ThreadedDebugging: PASS || FAIL
-
 # BUG(281): This test fails on some Linuxes.
 test-debug/DebuggerAgent: PASS, (PASS || FAIL) if $system == linux
 
 [ $arch == arm ]
 
 test-debug: SKIP
 
 # BUG(113): Test seems flaky on ARM.
 test-spaces/LargeObjectSpace: PASS || FAIL
 
 # BUG(240): Test seems flaky on ARM.
 test-api/RegExpInterruption: SKIP
 
 # BUG(271): During exception propagation, we compare pointers into the
 # stack.  These tests fail on the ARM simulator because the C++ and
 # the JavaScript stacks are separate.
 test-api/ExceptionOrder: PASS || FAIL
 test-api/TryCatchInTryFinally: PASS || FAIL