RFR: Cleanup unused _decompile and _ignore_decompile fields in AOTCodeEntry

[Ashutosh Mehra]

On Thu, 19 Jun 2025 13:36:36 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> New workflow always sets `_ignore_decompile` to true, which implies `AOTCodeEntry::_decompile` is not in `check_entry` and is thus redundant. These two fields can just be removed.
>
> My testing passed.

@vnkozlov thanks for the review and testing it.

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PR Comment: https://git.openjdk.org/leyden/pull/80#issuecomment-2988241790