8380750: Test runtime/cds/appcds/TestSerialGCWithCDS.java#id1 failed: StringIndexOutOfBoundsException

[matias9927]

This test was failing with this error:
java.lang.StringIndexOutOfBoundsException: Range [3973, 3) out of bounds for length 4540
due to an issue with getCrashMessage in CDSTestUtils. It is possible for the hserr log file to not be present with errors like OOME, so this had to be refactored to check for a more reliably present part of the error message. Verifed with tier 1-5 tests.

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Issue

• JDK-8380750: Test runtime/cds/appcds/TestSerialGCWithCDS.java#id1 failed: StringIndexOutOfBoundsException (Bug - P4)

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