[foreign-memaccess+abi] RFR: 8314071: Test java/foreign/TestByteBuffer.java timed out

[Per Minborg]

On Thu, 17 Aug 2023 09:04:26 GMT, Per Minborg <pminborg at openjdk.org> wrote:

> This PR proposes improving performance for two `VarHandle` objects and increasing the timeout for the tests.

This PR should go into the mainline

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PR Comment: https://git.openjdk.org/panama-foreign/pull/866#issuecomment-1681942693