Move fields common to Method and Field to executable, which simplifies implementation. Removed useless transient modifiers as Method and Field were never serializable.
------------- Commit messages: - Inline some common ctor + method fields to executable Changes: https://git.openjdk.org/jdk/pull/20188/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20188&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8336275 Stats: 451 lines in 11 files changed: 77 ins; 238 del; 136 mod Patch: https://git.openjdk.org/jdk/pull/20188.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/20188/head:pull/20188 PR: https://git.openjdk.org/jdk/pull/20188
