RFR: 8282722: Regard mapping array in enum switches as stable for constant folding

[Joshua Zhu]

On Mon, 7 Mar 2022 07:42:23 GMT, Jie Fu <jiefu at openjdk.org> wrote:

> Is there a jmh micro-ben to show the perf improvement? Or a jtreg test to show the inlining effect after this patch?
> 
> Copyright year in `fieldInfo.hpp` needs to be updated.
> 
> Thanks.

Thanks for your comments.
This change is an optimization workable for all enum switches.
Please check the example at http://cr.openjdk.java.net/~jzhu/8282722/
You can check the generated codes or IR graph of function "test2" for differences with/without this change.

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PR: https://git.openjdk.java.net/jdk/pull/7721