64bit fastdebug server vm crashes with assert(_base == Int,"Not an Int")

The crash is reproduced starting from hs11-b08 (jdk7b22)

hs11-b08:
# Internal Error (/BUILD_AREA/jdk7/hotspot/src/share/vm/opto/type.hpp:958), pid=14680, tid=1083214144
# Error: assert(_base == Int,"Not an Int")
#
# Java VM: Java HotSpot(TM) 64-Bit Server VM (11.0-b08-fastdebug compiled mode linux-amd64)

hs13-b02:
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/tmp/jprt-jprtadm/temp/P1/B/224246.rasbold/source/src/share/vm/opto/type.hpp:1035), pid=14739, tid=1084266816
# Error: assert(_base == Int,"Not an Int")
#
# Java VM: OpenJDK 64-Bit Server VM (13.0-b02-2008-06-03-224246.rasbold.hs-merge-fastdebug compiled mode linux-amd64 compressed oops)



The problem seems to be different than reported in 6646015 (fixed in hs13-b01).
The tests fail the same way but test case from 6646015 doesn't fail anymore,
new testcase continues to fail with latest hs13-b02 as well.
So, it seems to be the different problem.