RFR: 8281631: HashMap copy constructor and putAll can over-allocate table [v26]

[XenoAmess]

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

XenoAmess has updated the pull request incrementally with three additional commits since the last revision:

 - refactor tests
 - refactor tests
 - refactor WhiteBoxResizeTest

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7431/files
  - new: https://git.openjdk.java.net/jdk/pull/7431/files/261ae627..a4ca31d2

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7431&range=25
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7431&range=24-25

  Stats: 871 lines in 7 files changed: 534 ins; 337 del; 0 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