RFR: 8339698: x86 unused andw/orw/xorw/addw encoding could be removed [v2]

[Sandhya Viswanathan]

> x86 andw/orw/xorw encoding is missing 0x66 prefix. This bug was discovered as part of the x86 instruction encoding test generation tool and gtest ([JDK-8339507](https://bugs.openjdk.org/browse/JDK-8339507)). This fix is a precursor to the PR for JDK-8339507 (https://github.com/openjdk/jdk/pull/20857).
> 
> Best Regards,
> Sandhya

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

  Remove unused andw/orw/xorw/addw (reg, reg) instruction encoding

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Changes:
  - all: https://git.openjdk.org/jdk/pull/20901/files
  - new: https://git.openjdk.org/jdk/pull/20901/files/0ae3b954..faba2cc9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20901&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20901&range=00-01

  Stats: 29 lines in 2 files changed: 0 ins; 29 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/20901.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20901/head:pull/20901

PR: https://git.openjdk.org/jdk/pull/20901