RFR: 8281631: HashMap copy constructor and putAll can over-allocate table [v23]

[XenoAmess]

> 8281631: HashMap copy constructor and putAll can over-allocate table

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

  revert changes to IdentityHashMap

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7431/files
  - new: https://git.openjdk.java.net/jdk/pull/7431/files/e724cc04..475e040f

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7431&range=22
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7431&range=21-22

  Stats: 16 lines in 2 files changed: 0 ins; 13 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7431.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7431/head:pull/7431

PR: https://git.openjdk.java.net/jdk/pull/7431