Benchmark:
Exercise intermediate buffer in downcall handle returning an Arm64 "HFA".
# VM version: JDK 25-ea, OpenJDK 64-Bit Server VM, 25-ea+3-283
PointsAlloc.panama_by_value avgt 5 50.479 ± 3.653 ns/op
PointsAlloc.panama_by_value:·gc.alloc.rate avgt 5 16490.820 ± 1193.776 MB/sec
PointsAlloc.panama_by_value:·gc.alloc.rate.norm avgt 5 218.240 ± 0.001 B/op
PointsAlloc.panama_by_value:·gc.count avgt 5 136.000 counts
PointsAlloc.panama_by_value:·gc.time avgt 5 56.000 ms
# VM version: JDK 25-internal, OpenJDK 64-Bit Server VM, 25-internal-adhoc.mernst.jdk
PointsAlloc.panama_by_value avgt 5 17.549 ± 1.046 ns/op
PointsAlloc.panama_by_value:·gc.alloc.rate avgt 5 486.807 ± 28.467 MB/sec
PointsAlloc.panama_by_value:·gc.alloc.rate.norm avgt 5 2.240 ± 0.001 B/op
PointsAlloc.panama_by_value:·gc.count avgt 5 11.000 counts
PointsAlloc.panama_by_value:·gc.time avgt 5 19.000 ms
