RFR: 8349923: Refactor StackMapTable constructor and StackMapReader

[Matias Saavedra Silva]

On Fri, 14 Feb 2025 19:32:28 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> This patch refactors the `StackMapReader` to clean up the `StackMapTable` constructor. The `StackMapReader` class is extended to hold more fields used for verification purposes and allows for a simpler StackMapTable constructor. Additionally, in preparation for further changes to verification, the `_frame_count` may not be equal to the value reported by the classfile, so a new structure is used to generate the `_frame_array`. Verified with tier 1-5 tests
>
> Never mind, I do know why frame_count might change with your upcoming changes.

Thanks for the reviews and suggestions @coleenp and @dholmes-ora!

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PR Comment: https://git.openjdk.org/jdk/pull/23645#issuecomment-2669298522