RFR: 8333410: [AArch64] clean unused classes in nativeInst_aarch64.hpp

[kuaiwei]

Some classes in nativeInst_aarch64.hpp are unused and can be removed.

I checked with tier1 tests.

-------------

Commit messages:
 - Remove GOT and PLT classes
 - 8333410: [AArch64] clean unused classes in nativeInst_aarch64.hpp

Changes: https://git.openjdk.org/jdk/pull/19518/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19518&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8333410
  Stats: 265 lines in 2 files changed: 1 ins; 258 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/19518.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19518/head:pull/19518

PR: https://git.openjdk.org/jdk/pull/19518