[jdk17] RFR: 8271350: runtime/Safepoint tests use OutputAnalyzer::shouldMatch instead of shouldContaint

[Igor Ignatyev]

On Tue, 27 Jul 2021 23:09:15 GMT, David Holmes <dholmes at openjdk.org> wrote:

> This doesn't really make any difference but okay.
in case of `Timed out while spinning to reach a safepoint.`, it does ;)

thanks for the reviews!

-- Igor

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PR: https://git.openjdk.java.net/jdk17/pull/285