RFR: 8281631: HashMap.putAll can cause redundant space waste

[XenoAmess]

8281631: HashMap.putAll can cause redundant space waste

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Commit messages:
 - 9072610: HashMap.putAll can cause redundant space waste

Changes: https://git.openjdk.java.net/jdk/pull/7431/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7431&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8281631
  Stats: 8 lines in 2 files changed: 0 ins; 0 del; 8 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