RFR: 8281631: HashMap.putAll can cause redundant space waste [v3]

[XenoAmess]

> 8281631: HashMap.putAll can cause redundant space waste

XenoAmess has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new 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/f18fc5e4..bb42df9c

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7431&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7431&range=01-02

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