Integrated: 8259341:Remove useage of JNFCallVoidMethod from Metal.

[Phil Race]

convert jnf to jni

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Commit messages:
 - 8259341:Remove useage of JNFCallVoidMethod from Metal.

Changes: https://git.openjdk.java.net/lanai/pull/149/files
 Webrev: https://webrevs.openjdk.java.net/?repo=lanai&pr=149&range=00
  Stats: 5 lines in 1 file changed: 2 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/lanai/pull/149.diff
  Fetch: git fetch https://git.openjdk.java.net/lanai pull/149/head:pull/149

PR: https://git.openjdk.java.net/lanai/pull/149