[8u] RFR + RFA: 8209639: assert failure in coalesce.cpp: attempted to spill a non-spillable item

[Roland Westrelin]

> It seems you are missing last parameter 'ireg' in assert() call.

Thanks Vladimir. Updated webrev:

http://cr.openjdk.java.net/~roland/8209639-8u/webrev.01/

Roland.