RFR(XXS) 8192756: SIGSEGV in nmethod::new_native_nmethod

[Igor Veresov]

Add the missing null check.

Webrev: http://cr.openjdk.java.net/~iveresov/8192756/webrev.00/ <http://cr.openjdk.java.net/~iveresov/8192756/webrev.00/>

Thanks,
igor
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