RFR: 8265231: (fc) ReadDirect and WriteDirect tests fail after fix for JDK-8264821

[Daniel D.Daugherty]

On Wed, 14 Apr 2021 18:28:06 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

> Please review this request to fix a test build failure caused by removing the `isDirectIOSupportedByFS()` method from the test `DirectIOTest` but not removing its use in other tests.
> 
> This also addresses the comment [1] in PR [2] of [3].
> 
> [1] https://github.com/openjdk/jdk/pull/3482#discussion_r613362581
> [2] https://github.com/openjdk/jdk/pull/3482
> [3] https://bugs.openjdk.java.net/browse/JDK-8264821

I don't think the bots will let me do this but:

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PR: https://git.openjdk.java.net/jdk/pull/3498