RFR: 8284780: Need methods to create pre-sized HashSet and LinkedHashSet [v18]

[XenoAmess]

> as title.

XenoAmess has updated the pull request incrementally with two additional commits since the last revision:

 - remove null check for Capacitiable in WhiteBoxResizeTest
 - Rename type variable per CSR request; minor spec wording change.

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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/98bfb0e1..bacc9ca8

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8302&range=17
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8302&range=16-17

  Stats: 19 lines in 3 files changed: 0 ins; 13 del; 6 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