RFR: 8269962: SA has unused Hashtable, Dictionary classes

[Coleen Phillimore]

See bug for more details. This code is unused and is soon going to be not in hotspot.
I left in logBytesPerWord() from my previous change because it might be useful in the SA.  I could remove it if opinion warrants.
Ran tier1-3.

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Commit messages:
 - 8269962: SA has unused Hashtable, Dictionary classes

Changes: https://git.openjdk.java.net/jdk/pull/4708/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4708&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8269962
  Stats: 669 lines in 14 files changed: 0 ins; 666 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4708.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4708/head:pull/4708

PR: https://git.openjdk.java.net/jdk/pull/4708