Intriduced by JDK-8361639

Testing top frames for events: jdk.FileRead (RandomAccessFile, FileInputStream, Files.newInputStream and Files.newByteChannel)
******************************************************************************************************************************
Expected:
jdk.jfr.event.io.TestIOTopFrame::readFilesNew 1
jdk.jfr.event.io.TestIOTopFrame::readRAF 20
jdk.jfr.event.io.TestIOTopFrame::readStream 15

Actual:
jdk.jfr.event.io.TestIOTopFrame::readFilesNew 1
jdk.jfr.event.io.TestIOTopFrame::readRAF 19
jdk.jfr.event.io.TestIOTopFrame::readStream 15
jdk.jfr.event.io.TestIOTopFrame::testFileRead 1

...
----------System.err:(13/796)----------
java.lang.Exception: Top methods are not as expected
at jdk.jfr.event.io.TestIOTopFrame.assertTopFrames(TestIOTopFrame.java:345)
at jdk.jfr.event.io.TestIOTopFrame.testFileRead(TestIOTopFrame.java:106)
at jdk.jfr.event.io.TestIOTopFrame.main(TestIOTopFrame.java:85)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
at java.base/java.lang.reflect.Method.invoke(Method.java:565)
at com.sun.javatest.regtest.agent.MainWrapper$MainTask.run(MainWrapper.java:138)
at java.base/java.lang.Thread.run(Thread.java:1474)