RFR: 8287695: Use String.contains() instead of String.indexOf() in jdk.hotspot.agent

[Andrey Turbanov]

On Wed, 1 Jun 2022 20:59:41 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

> Please make sure you run the SA tests.

This one, `test/hotspot/jtreg/serviceability` right?

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PR: https://git.openjdk.java.net/jdk/pull/8966