Revert [JDK-8152664](https://bugs.openjdk.org/browse/JDK-8152664) RFE [changes](https://github.com/openjdk/jdk/commit/b853eb7f5ca24eeeda18acbb14287f706499c365) which was used for AOT [JEP 295](https://openjdk.org/jeps/295) implementation in JDK 9. The code was left in HotSpot assuming it will help in a future. But during work on Leyden we decided to not use it. In Leyden cached compiled code will be restored in CodeCache as normal nmethods: no need to change VM's runtime and GC code to process them.
I may work on optimizing `CodeBlob` and `nmethod` fields layout to reduce header size in separate changes. In these changes I did simple fields reordering to keep small (1 byte) fields together. I do not see (and not expected) performance difference with these changes. Tested tier1-5, xcomp, stress. Running performance testing. I need help with testing on platforms which Oracle does not support. ------------- Commit messages: - remove trailing whitespace - 8329332: Remove CompiledMethod and CodeBlobLayout classes Changes: https://git.openjdk.org/jdk/pull/18554/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18554&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8329332 Stats: 3885 lines in 118 files changed: 1281 ins; 1723 del; 881 mod Patch: https://git.openjdk.org/jdk/pull/18554.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/18554/head:pull/18554 PR: https://git.openjdk.org/jdk/pull/18554
