RFR: Cleanup unused _decompile and _ignore_decompile fields in AOTCodeEntry

[Vladimir Kozlov]

On Thu, 19 Jun 2025 03:16:18 GMT, Ashutosh Mehra <asmehra 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.

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Marked as reviewed by kvn (Committer).

PR Review: https://git.openjdk.org/leyden/pull/80#pullrequestreview-2943054146