RFR: 8341006: Optimize StackMapGenerator detect frames [v3]

[Chen Liang]

On Thu, 3 Oct 2024 13:15:10 GMT, Shaojin Wen <swen at openjdk.org> wrote:

>> 1. Construct Frames directly without BitSet
>> 2. Use Frame[] instead of ArrayList
>> 3. Use EMPTY_FRAME_ARRAY for initialization. No need to allocate objects when there is no frame.
>
> Shaojin Wen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   reduce codeSize

Thanks for this last-minute small change cleanup.

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Marked as reviewed by liach (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/21183#pullrequestreview-2345588574