RFR: JDK-8283140: Remove unused encoding classes/operands from x86_64.ad

Mon Oct 23 17:57:54 UTC 2023

These encoding classes became dead code when the instructions' definitions were patched to use the MacroAssembler.

Tested with tier 1-3 on Linux, Windows & MacOS.

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Commit messages:
 - Remove unused encoding classes in x86_64.ad

Changes: https://git.openjdk.org/jdk/pull/16319/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16319&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8283140
  Stats: 993 lines in 1 file changed: 9 ins; 958 del; 26 mod
  Patch: https://git.openjdk.org/jdk/pull/16319.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16319/head:pull/16319

PR: https://git.openjdk.org/jdk/pull/16319