[Backport] 8319053: Segment dump files remain after parallel heap dump on Windows #715
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Summary: Segment file is closed from DumpWriter dtor. On Unix systems remove can delete an opened file, on Windows it fails with "access denied". The fix destroys DumpWriter objects for segment files after all data are dumped
Test Plan: HeapDumpParallelTest.java
Reviewed-by: D-D-H, yuleil
Issue: #714