Fix UnsafeApi arrayBaseOffset

[pveentjer]

With JDK 25 the Unsafe function arrayBaseOffset changed the return type from int to long.

This PR fixed the UnsafeAPI so that at runtime it is determined which Unsafe method is available using INVOKE_DYNAMIC and then calls it.

There is no API change; an int will always be returned but a guard is added on JDK 25+ to ensure that the returned long doesn't exceed int min/max.

Benchmarks results

INVOKE_DYNAMIC
Benchmark                                                Mode  Cnt   Score    Error   Units
UnsafeArrayBaseOffsetBenchmark.jdk23                     avgt    3   9.267 ±  4.050   ns/op
UnsafeArrayBaseOffsetBenchmark.jdk23:gc.alloc.rate       avgt    3   0.001 ±  0.001  MB/sec
UnsafeArrayBaseOffsetBenchmark.jdk23:gc.alloc.rate.norm  avgt    3  ≈ 10⁻⁵             B/op
UnsafeArrayBaseOffsetBenchmark.jdk23:gc.count            avgt    3     ≈ 0           counts
UnsafeArrayBaseOffsetBenchmark.jdk25                     avgt    3   9.110 ±  5.813   ns/op
UnsafeArrayBaseOffsetBenchmark.jdk25:gc.alloc.rate       avgt    3   0.001 ±  0.001  MB/sec
UnsafeArrayBaseOffsetBenchmark.jdk25:gc.alloc.rate.norm  avgt    3  ≈ 10⁻⁵             B/op
UnsafeArrayBaseOffsetBenchmark.jdk25:gc.count            avgt    3     ≈ 0           counts

And the reflection based solution that currently is in master:

Benchmark                                                Mode  Cnt     Score     Error   Units
UnsafeArrayBaseOffsetBenchmark.jdk23                     avgt    3  1013.438 ± 113.517   ns/op
UnsafeArrayBaseOffsetBenchmark.jdk23:gc.alloc.rate       avgt    3   158.094 ±  17.759  MB/sec
UnsafeArrayBaseOffsetBenchmark.jdk23:gc.alloc.rate.norm  avgt    3   168.001 ±   0.001    B/op
UnsafeArrayBaseOffsetBenchmark.jdk23:gc.count            avgt    3    17.000            counts
UnsafeArrayBaseOffsetBenchmark.jdk23:gc.time             avgt    3    16.000                ms
UnsafeArrayBaseOffsetBenchmark.jdk25                     avgt    3   824.205 ±  12.531   ns/op
UnsafeArrayBaseOffsetBenchmark.jdk25:gc.alloc.rate       avgt    3   194.384 ±   2.860  MB/sec
UnsafeArrayBaseOffsetBenchmark.jdk25:gc.alloc.rate.norm  avgt    3   167.998 ±   0.078    B/op
UnsafeArrayBaseOffsetBenchmark.jdk25:gc.count            avgt    3    20.000            counts
UnsafeArrayBaseOffsetBenchmark.jdk25:gc.time             avgt    3    17.000                ms

[vyazelenko]

Fixed with 21d5603.