RFR: JDK-8304884: Update Bytecodes data to be mostly compile time constants

[Julian Waters]

On Fri, 24 Mar 2023 16:14:50 GMT, Justin King <jcking at openjdk.org> wrote:

> Change uses a few tricks to make most of the data in Bytecodes compile time constant, avoiding the overhead during VM initialization. `Bytecodes:_flags` likely can be made compile time constant as well using `constexpr` tricks, but that is out of scope for this specific PR.

Not a review, but I want to point out that Bytecodes::_flags is declared as a jchar and defined as an unsigned short, might probably be helpful and less confusing to make it an unsigned short in both places. No comment on the other changes

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PR Comment: https://git.openjdk.org/jdk/pull/13179#issuecomment-1483152951