[test] Skip flaky test for turbofan on windows.

BUG=v8:4573
LOG=n
TBR=mstarzinger@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/1465193006

Cr-Commit-Position: refs/heads/master@{#32276}

test/cctest/cctest.status

@@ -240,6 +240,8 @@
   # BUG(3331). Fails on windows.
   'test-heap/NoWeakHashTableLeakWithIncrementalMarking': [SKIP],
 
+  # BUG(v8:4573).
+  'test-api/MultipleIsolatesOnIndividualThreads': [PASS, NO_VARIANTS],
 }],  # 'system == windows'
 
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