[8u] RFR(XS): 8180813: Null pointer dereference of CodeCache::find_blob() result

[Tobias Hartmann]

Hi,

please review the following backport to JDK 8u:

8180813: Null pointer dereference of CodeCache::find_blob() result
http://cr.openjdk.java.net/~thartmann/8180813/webrev.00/
http://hg.openjdk.java.net/jdk9/dev/hotspot/rev/63ac6d565c21
http://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2017-May/026307.html

The backport does not apply cleanly because "is_compiled" is called "is_nmethod" and "as_compiled_method_or_null" is called "as_nmethod_or_null" in JDK 8u.

Here's the new webrev:
http://cr.openjdk.java.net/~thartmann/8180813_8u/webrev.00/

I'll request approval in a separate thread on jdk8u-dev.

Thanks,
Tobias