RFR: 8281631: HashMap copy constructor and putAll can over-allocate table [v30]

[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:

  refine test

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7431/files
  - new: https://git.openjdk.java.net/jdk/pull/7431/files/3f1e0e7c..866b4606

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7431&range=29
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7431&range=28-29

  Stats: 383 lines in 1 file changed: 277 ins; 15 del; 91 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