RFR: 8259339: AllocateUninitializedArray C2 intrinsic fails with void.class input

[Vladimir Kozlov]

On Wed, 6 Jan 2021 17:38:00 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

> Since [JDK-8150465](https://bugs.openjdk.java.net/browse/JDK-8150465), `LibraryCallKit::inline_unsafe_newArray` is also used by the `_allocateUninitializedArray` intrinsic. To handle a `void.class` input, a runtime (slow) call to the intrinsified method is emitted. We hit a guarantee in `generate_method_call_static` because a wrong intrinsic id is passed. Also, the call to `Unsafe.allocateUninitializedArray0` should be virtual.
> 
> I found this when running Valhalla stress testing with `-XX:PerMethodTrapLimit=0` but it easily reproduces without (see modified test).
> 
> Thanks,
> Tobias

Good.

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Marked as reviewed by kvn (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/1965