RFR(S): 8078866: compiler/eliminateAutobox/6934604/TestIntBoxing.java assert(p_f->Opcode() == Op_IfFalse) failed

[Roland Westrelin]

As suggested by Vladimir, here is a new simpler fix that simply bails out of range check elimination if the preloop is not found:

http://cr.openjdk.java.net/~roland/8078866/webrev.01/

Removing the main and post loops will be pushed as a separate RFE.

Roland.