RFR: 8281631: HashMap.putAll can cause redundant space waste [v4]

[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/bb42df9c..2a1bf274

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7431&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7431&range=02-03

  Stats: 5 lines in 1 file changed: 4 ins; 0 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