RFR: 8286298: Remove unused methods in sun.invoke.util.VerifyType [v2]

[Claes Redestad]

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

Claes Redestad has updated the pull request incrementally with one additional commit since the last revision:

  Inline isNullReferenceConversion at sole call site and remove it as well

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8570/files
  - new: https://git.openjdk.java.net/jdk/pull/8570/files/a456de4f..b2d1af4b

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8570&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8570&range=00-01

  Stats: 19 lines in 2 files changed: 2 ins; 14 del; 3 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