RFR(S): 8203364: JFR start failure after AppCDS archive created with JFR StartFlightRecording

[Calvin Cheung]

bug: https://bugs.openjdk.java.net/browse/JDK-8203664

webrev: http://cr.openjdk.java.net/~ccheung/8203364/webrev.00/

The bug is due to some classes are being redefined during JFR startup. 
The proposed change is to handle redefined classes better during dump time.

Summary of changes:

klassFactory.cpp:

     Only do the following assert if a class hasn't been redefined:

     244       assert(cached_class_file == NULL, "Sanity");

classLoader.cpp:

     include JFR classes which are loaded via 'JVM_DefineClass'

dictionary.cpp:

     during dumping, exclude classes which have been redefined.

     Only very few classes are being redefined with JFR enabled during 
dumping:

     java/lang/Throwable
     java/net/SocketOutputStream
     java/net/SocketInputStream
     sun/nio/ch/SocketChannelImpl
     java/io/FileOutputStream
     java/lang/Error
     sun/nio/ch/FileChannelImpl
     java/io/FileInputStream
     java/io/RandomAccessFile

The change passed hs-tier[1,2,3] testing.

thanks,

Calvin