RFR: 8339290: Optimize ClassFile Utf8EntryImpl#writeTo [v5]

[Shaojin Wen]

> Use fast path for ascii characters 1 to 127 to improve the performance of writing Utf8Entry to BufferWriter.

Shaojin Wen has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 21 additional commits since the last revision:

 - Update src/java.base/share/classes/java/lang/StringCoding.java
   
   Co-authored-by: ExE Boss <3889017+ExE-Boss at users.noreply.github.com>
 - vectorized countGreaterThanZero
 - add comments
 - optimization for none-ascii latin1
 - Revert "vectorized countGreaterThanZero"
   
   This reverts commit 88a77722c8f5401ac28572509d6a08b3e88e8e40.
 - vectorized countGreaterThanZero
 - copyright
 - use JLA if length < 256
 - fix utf_len error
 - code style
 - ... and 11 more: https://git.openjdk.org/jdk/compare/66682133...2a36b443

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Changes:
  - all: https://git.openjdk.org/jdk/pull/20772/files
  - new: https://git.openjdk.org/jdk/pull/20772/files/34aab42d..2a36b443

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20772&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20772&range=03-04

  Stats: 4359 lines in 151 files changed: 2931 ins; 319 del; 1109 mod
  Patch: https://git.openjdk.org/jdk/pull/20772.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20772/head:pull/20772

PR: https://git.openjdk.org/jdk/pull/20772