RFR: 8368962: hotspot/cpu/aarch64/bytecodes_aarch64.{hpp, cpp} is unused

[Justin King]

Remove deadcode.

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Commit messages:
 - Delete unused AArch64-specific bytecodes header and source files

Changes: https://git.openjdk.org/jdk/pull/27577/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27577&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8368962
  Stats: 59 lines in 2 files changed: 0 ins; 59 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/27577.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27577/head:pull/27577

PR: https://git.openjdk.org/jdk/pull/27577