RFR: 8343436: Regression in StackMapGenerator after JDK-8339205

[Chen Liang]

On Fri, 1 Nov 2024 15:03:51 GMT, Adam Sotona <asotona at openjdk.org> wrote:

> JDK-8339205 introduced multiple regressions in StackMapGenerator and added a lot of new untested code.
> 
> This patch reverts StackMapGenerator to the state before JDK-8339205 and adds one regression test.
> 
> Please review.
> 
> Thanks,
> Adam

Looks good.  For the future, do we want to expand this test to cover more instructions, or is this just added for the particular bug?

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Marked as reviewed by liach (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/21835#pullrequestreview-2410298707