RFR: 8340708: Optimize StackMapGenerator::processMethod [v3]

[Chen Liang]

On Tue, 24 Sep 2024 05:04:19 GMT, Shaojin Wen <swen at openjdk.org> wrote:

>> A small optimization of processMethod, by using local variables and extracting exception methods, reduces codeSize from 326 to 283
>
> Shaojin Wen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   reduce getFrame

Marked as reviewed by liach (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/21137#pullrequestreview-2325678251