The attached test case fails an assertion on all x86 and amd64 platforms.
How to reproduce: java -server -Xcomp Tester_6749

# An unexpected error has been detected by HotSpot Virtual Machine:
#
# Internal Error (/BUILD_AREA/jdk6.0/hotspot/src/share/vm/opto/cfgnode.hpp, 130), pid=2653, tid=2894379952
#
# Java VM: Java HotSpot(TM) Server VM (1.6.0-ea-fastdebug-b56-debug compiled mode)
#
# Error: assert(r != __null && r->is_Region(),"Not valid control")

--------------- T H R E A D ---------------

Current thread (0x0811a000): JavaThread "CompilerThread1" daemon [_thread_in_native, id=2659]

Stack: [0xac7cb000,0xac84c000), sp=0xac849e00, free space=507k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x8b1578]
V [libjvm.so+0x3e0f95]
V [libjvm.so+0x302350]
V [libjvm.so+0x78c307]
V [libjvm.so+0x78be8e]
V [libjvm.so+0x393d7d]
V [libjvm.so+0x39047e]
V [libjvm.so+0x2ed3f6]
V [libjvm.so+0x39ce6c]
V [libjvm.so+0x39c457]
V [libjvm.so+0x85a42c]
V [libjvm.so+0x73b102]
C [libpthread.so.0+0x528c]


Current CompileTask:
opto:288 b Tester_6749_Class_1.<init>()V (185 bytes)