RFR: 8349088: De-virtualize Codeblob and nmethod

[Vladimir Kozlov]

Remove virtual methods from CodeBlob and nmethod to simplify saving/restoring in Leyden AOT cache. It avoids the need to patch hidden VPTR pointer to class's virtual table.

Added C++ static asserts to make sure no virtual methods are added in a future.

Fixed/cleaned SA code which process CodeBlob and its subclasses. Use `CodeBlob::_kind` field value to determine the type of blob.

Tested tier1-5, hs-tier6-rt (for JFR testing), stress, xcomp

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

Commit messages:
 - 8349088: De-virtualize Codeblob and nmethod

Changes: https://git.openjdk.org/jdk/pull/23533/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23533&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8349088
  Stats: 518 lines in 23 files changed: 235 ins; 215 del; 68 mod
  Patch: https://git.openjdk.org/jdk/pull/23533.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23533/head:pull/23533

PR: https://git.openjdk.org/jdk/pull/23533