RFR (XS): 8208480: Fix for test failure: assert(is_bound() || is_unused()) after JDK-8206075 in C1

[Haug, Gunter]

Hi all,

could I please have  a review and a sponsor for this tiny fix:

https://bugs.openjdk.java.net/browse/JDK-8208480
http://cr.openjdk.java.net/~ghaug/webrevs/8208480

C1 holds a label to the unwind handler during compilation. There are bail-out paths where a branch to this label has already been emitted but the handler hasn't (e.g. code cache full). The label is therefore unbound when the destructor is invoked and the assertion fires.

Thanks,
Gunter