RFR: 8267612: Declare package-private VarHandle.AccessMode/-Type counts

[Claes Redestad]

Slightly reduce VarHandle startup overhead by introducing package-private COUNT constants for two enums

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Commit messages:
 - Declare package-private VarHandle.AccessMode/-Type counts

Changes: https://git.openjdk.java.net/jdk/pull/4164/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4164&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8267612
  Stats: 18 lines in 4 files changed: 8 ins; 2 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4164.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4164/head:pull/4164

PR: https://git.openjdk.java.net/jdk/pull/4164