RFR(XS): 8189649: AOT: assert(caller_frame.cb()->as_nmethod_or_null() == cm) failed: expect top frame nmethod

[dean.long at oracle.com]

https://bugs.openjdk.java.net/browse/JDK-8189649

http://cr.openjdk.java.net/~dlong/8189649/webrev/


We just need to relax the assert to allow any compiled method.


dl