Trivially fix the resolution of the `NF_UNSAFE` named function to use the 
appropriate lookup mode.

In [JDK-8187826](https://bugs.openjdk.java.net/browse/JDK-8187826) we changed 
from regular reflection to use a `NamedFunction` for this field, but it appears 
the lookup mode came out wrong. This mismatch appears to be benign and ignored 
by HotSpot, but a user implementing an experimental JVM ran into some issues 
(and additionally noticed the resolve throws the wrong exception). 

This patch is a point fix to this particular issue, but I think we should 
consider following up with a stronger assertion or test for proper staticness 
of fields somewhere when resolving fields via 
`MemberName.getFactory().resolveOrNull(..)`.

-------------

Commit messages:
 - Use correct lookup mode for MethodHandleStatics.UNSAFE

Changes: https://git.openjdk.java.net/jdk/pull/8297/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8297&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8285007
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8297.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8297/head:pull/8297

PR: https://git.openjdk.java.net/jdk/pull/8297

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