RFR: 8267612: Declare package-private VarHandle.AccessMode/-Type counts [v2]

[Claes Redestad]

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

Claes Redestad has updated the pull request incrementally with one additional commit since the last revision:

  Mandy review

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4164/files
  - new: https://git.openjdk.java.net/jdk/pull/4164/files/89f7c64d..5b5e719f

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4164&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4164&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 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