[9] RFR (S): 8174721: C1: Inlining through MH invokers/linkers in unreachable code is unsafe

[Vladimir Ivanov]

http://cr.openjdk.java.net/~vlivanov/8174721/webrev.00/
https://bugs.openjdk.java.net/browse/JDK-8174721

8166110 didn't touch C1, but newly added regression test provoked 
similar failure there.

Add signature checks between linker & target methods to ensure inlining 
doesn't happen for evidently broken cases.

Testing: regression test, JPRT, RBT

Thanks!

Best regards,
Vladimir Ivanov