RFR: 8234499: [Graal] compiler/compilercontrol/CompilationModeHighOnlyTest.java test fails with timeout

[Jie Fu]

Hi all,

May I get reviews for this small fix?

JBS:    https://bugs.openjdk.java.net/browse/JDK-8234499
Webrev: http://cr.openjdk.java.net/~jiefu/8234499/webrev.00/

And I need a sponsor.

Thanks a lot.
Best regards,
Jie