RFR: JDK-8274170: Add hooks for custom makefiles to augment jtreg test execution

[Erik Joelsson]

On Thu, 23 Sep 2021 22:02:07 GMT, Mikhailo Seledtsov <mseledtsov at openjdk.org> wrote:

> Please review this small change that adds hook for custom makefiles to augment parameters for jtreg test execution.

Marked as reviewed by erikj (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/5666