RFR(s): 8222640: Remove deopt suspend

[Robbin Ehn]

Hi all, please consider this change.

The code for deopt suspend is no longer needed since today the register window
is always flushed when this code executes. Exactly when this code was needed is 
not clear, entered via duke changeset 1. I did not dig since we no longer have 
such use case.

Webrev:
http://cr.openjdk.java.net/~rehn/8222640/webrev/
Issue:
https://bugs.openjdk.java.net/browse/JDK-8222640

Passes t1-5.

Thanks, Robbin