<i18n dev> RFR: 8367271: Add parsing tests to DateFormat JMH benchmark [v2]

[Justin Lu]

> This PR expands the DateFormat benchmark with parsing cases (in addition to the existing formatting ones) such that performance regressions are easier to identify for parsing. Also adding in a time instance and respective measurement tests.  The patterns used correspond to FULL Locale.ENGLISH patterns (w/ the NBSP replaced for time pattern for clarity sake).
> 
> Further context in comment on JBS issue.

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

  Implement Naoto's suggestions

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Changes:
  - all: https://git.openjdk.org/jdk/pull/27204/files
  - new: https://git.openjdk.org/jdk/pull/27204/files/2bdfbbc3..54e1036f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27204&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27204&range=00-01

  Stats: 222 lines in 2 files changed: 111 ins; 111 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/27204.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27204/head:pull/27204

PR: https://git.openjdk.org/jdk/pull/27204