The attached program triggers assertion failure in the server compiler fastdebug flavor.
How to reproduce: java -server -Xcomp Tester_10

# An unexpected error has been detected by HotSpot Virtual Machine:
#
# Internal Error (/BUILD_AREA/jdk6.0/hotspot/src/share/vm/opto/cfgnode.hpp, 128), pid=10095, tid=2893937584
#
# Java VM: Java HotSpot(TM) Server VM (1.6.0-ea-fastdebug-b52-debug compiled mode)
#
# Error: assert(r != __null && r->is_Region(),"Not valid control")
# An error report file with more information is saved as hs_err_pid10095.log