RFR: 8261666: [mlvm] Remove WhiteBoxHelper

[Igor Ignatyev]

On Wed, 17 Feb 2021 15:41:25 GMT, Evgeny Nikitin <enikitin at openjdk.org> wrote:

> The mlvm test suite used this class for situations when WhiteBox was not available during the test's build time - therefore, the test tried to find the WhiteBox on runtime.
> 
> These days, the WhiteBox is always available so this is not the case. The said helper is to be removed and its only user adjusted.
> 
> Testing: test/hotspot/jtreg/vmTestBase/vm/mlvm on linux/mac/windows x64.

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Marked as reviewed by iignatyev (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/2609