RFR: JDK-8300912: Update java/nio/MappedByteBuffer/PmemTest.java to run on x86_64 only

[Bill Huang]

On Tue, 31 Jan 2023 20:40:28 GMT, Alan Bateman <alanb at openjdk.org> wrote:

>> This task is created to update jtreg test to run on x86 only because pmem emulation is only supported on x86. For other architectures with external NVRAM, run test with java PmemTest.
>
> Maybe @adinn could comment on this as I thought this test was meant for both x64 and aarch64.

@AlanBateman Yes, this test was for both x64 and aarch64. The changes here are meant to not run test with jtreg on non-x64 system. This is because our manual test vendor can only support pmem emulation on x64 systems for this test. The test will always fail on aarch64 Linux systems. For someone who wants to test pmem with an external device, it is always allowed to compile and run the test manually.

-------------

PR: https://git.openjdk.org/jdk/pull/12352