RFR: 8284780: Need methods to create pre-sized HashSet and LinkedHashSet [v2]

[XenoAmess]

> as title.

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

  fix LinkedHashSet constructor

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8302/files
  - new: https://git.openjdk.java.net/jdk/pull/8302/files/436273ed..b139366c

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8302&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8302&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 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