RFR: 8284780: Need methods to create pre-sized HashSet and LinkedHashSet [v19]

[XenoAmess]

> as title.

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

  clean up Calendar

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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/bacc9ca8..95d59b97

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8302&range=18
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8302&range=17-18

  Stats: 8 lines in 1 file changed: 0 ins; 7 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