RFR: 8281631: HashMap.putAll can cause redundant space waste [v6]

[XenoAmess]

> 8281631: HashMap.putAll can cause redundant space waste

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

  9072610: HashMap.putAll can cause redundant space waste

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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/c6654478..4e42cae1

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7431&range=05
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7431&range=04-05

  Stats: 3 lines in 2 files changed: 0 ins; 1 del; 2 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