RFR: 8339167: Remove AbstractPoolEntry.PrimitiveEntry to reduce boxing overheads [v2]

[Claes Redestad]

> Removing PrimitiveEntry reduces boxing/unboxing and removes a class.

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

  Wrong hash for FloatEntryImpl

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/20749/files
  - new: https://git.openjdk.org/jdk/pull/20749/files/028c0e9b..e7dbd1c1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20749&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20749&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/20749.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20749/head:pull/20749

PR: https://git.openjdk.org/jdk/pull/20749