RFR: 8284780: Need methods to create pre-sized HashSet and LinkedHashSet [v5]

[XenoAmess]

> as title.

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

  add apiNote s

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8302/files
  - new: https://git.openjdk.java.net/jdk/pull/8302/files/f051c1fa..26bb5792

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8302&range=04
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8302&range=03-04

  Stats: 16 lines in 2 files changed: 16 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8302.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8302/head:pull/8302

PR: https://git.openjdk.java.net/jdk/pull/8302