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  1. JDK
  2. JDK-8285645

Consolidating Hashtable cleanup

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      BasicHashtble's destructor only frees hashtable buckets, but not entries in the hashtable, that results a lot of duplicated code of its subclasses to cleanup hashtable entries.

      The duplicated code can be consolidated into the base class.

      There is a discussion here: https://github.com/openjdk/jdk/pull/8148#issuecomment-1092088844

      Also, there is no point to complicate Entry allocation: first allocate memory, then invoke placement new.

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            Reporter:
            zgu Zhengyu Gu
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