RFR(XS): 8024008: Nashorn V8 (Crypto) benchmark crashes with small CodeCache size

[Albert Noll]

Hi,

thanks for reviewing this patch.

https://bugs.openjdk.java.net/browse/JDK-8024008
http://cr.openjdk.java.net/~anoll/8024008/webrev.00/ 
<http://cr.openjdk.java.net/%7Eanoll/8024008/webrev.00/>

Many thanks in advance,
Albert

Problem:
The state of nmethods that are currently locked by the VM must not change.
Some operations such as setting ICs (e.g., 
SharedRuntime::resolve_sub_helper())
rely on this fact.  'nmethod::make_not_entrant_or_zombie does not make this
check.

Solution:
Do method state unchanged of nmethod is locked by the VM.

Testing: Run Octane benchmarks on top of Nashorn with small code cache 
size (16m).

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