RFR: 8245309: Re-examine use of ThreadLocalCoders in sun.net.www.ParseUtil [v2]

[Julia Boes]

> Replaced the use of ThreadLocalCoders with regular non-caching CharsetEncoder and added a benchmark to confirm that
> there is no performance impact.

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

  fix typo in test and cleanup benchmark

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/170/files
  - new: https://git.openjdk.java.net/jdk/pull/170/files/1d6b862f..d7542872

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=170&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=170&range=00-01

  Stats: 19 lines in 2 files changed: 3 ins; 3 del; 13 mod
  Patch: https://git.openjdk.java.net/jdk/pull/170.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/170/head:pull/170

PR: https://git.openjdk.java.net/jdk/pull/170