RFR: 8354871: Replace stack map frame type magics with constants [v3]

[Chen Liang]

On Sat, 6 Sep 2025 13:48:53 GMT, Francesco Andreuzzi <duke at openjdk.org> wrote:

>> In this PR I introduce some constants in `StackMapGenerator`. No change in logic is expected.
>> 
>> Passes tests in `jdk/classfile`.
>
> Francesco Andreuzzi has updated the pull request incrementally with one additional commit since the last revision:
> 
>   inclusive

Reviewer's note: This brings more parity with c++ verifier code as done in JDK-8359920 (28e96e333b61dfe60a84a48ff59bdf10c529f8be)

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PR Comment: https://git.openjdk.org/jdk/pull/27029#issuecomment-3262216411