After JDK-8354887 was integrated we hit strange failures which looks like memory stomps during our JCK testing of AOT new JEPs:

# Internal Error (/workspace/open/src/hotspot/share/opto/regmask.hpp:222), pid=4186624, tid=4186658
# assert(_RM_UP[i] == 0) failed: _hwm too low: 5 regs at: 4
or

# Internal Error (/workspace/open/src/hotspot/share/opto/type.cpp:996), pid=2832821, tid=2832868
# fatal error: meet not symmetric
or other strange issues during C2 compilation

After investigating (running tests in loop) I narrowed down the issue to AOT caching of C2 runtime stubs:

https://github.com/openjdk/jdk/blob/master/src/hotspot/share/opto/output.cpp#L3491