CTW with EA: assert(n != 0L,"Bad immediate dominator info.")

on x64:

% java -d64 -XX:CICompilerCount=8 -XX:+DoEscapeAnalysis -XX:+UseCompressedOops -XX:-CheckCompressedOops -XX:CompileThreshold=100 -Xss4m -Xverify:all -XX:+CompileTheWorld -XX:CompileTheWorldStartAt=1 -Xbootclasspath/p:/net/vmsqe.sfbay/export/backup/testbase/CompileTheWorld/jarfiles/Ev_3p_common.jar
...
CompileTheWorld (2788) : symantec/itools/awt/DirectionButtonBeanInfo
CompileTheWorld (2789) : symantec/itools/awt/FormattedTextField$Key
CompileTheWorld (2790) : symantec/itools/awt/FormattedTextField
# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc: SuppressErrorAt=/loopnode.hpp:634
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/tmp/jprt-jprtadm/P1/B/230141.kvn/source/src/share/vm/opto/loopnode.hpp:634), pid=17145, tid=17
# Error: assert(n != 0L,"Bad immediate dominator info.")
#

Current CompileTask:
C2:21739 b symantec.itools.awt.FormattedTextField.applyMask(Ljava/lang/String;)Ljava/lang/String; (291 bytes)