RFR: 8286298: Remove unused methods in sun.invoke.util.VerifyType

[Claes Redestad]

A few untested and unused methods in `VerifyType` which can be removed. (Possibly used by native JSR 292 implementations in JDK 7).

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Commit messages:
 - Remove unused methods in sun.invoke.util.VerifyType

Changes: https://git.openjdk.java.net/jdk/pull/8570/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8570&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8286298
  Stats: 72 lines in 1 file changed: 0 ins; 71 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8570.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8570/head:pull/8570

PR: https://git.openjdk.java.net/jdk/pull/8570