RFR: 8186958: Need method to create pre-sized HashMap [v4]

[XenoAmess]

> 8186958: Need method to create pre-sized HashMap

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

  use jmh Blackhole

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7928/files
  - new: https://git.openjdk.java.net/jdk/pull/7928/files/45f4aae9..435793c9

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7928&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7928&range=02-03

  Stats: 13 lines in 1 file changed: 1 ins; 4 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7928.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7928/head:pull/7928

PR: https://git.openjdk.java.net/jdk/pull/7928