RFR: 8282085: The REGISTER_DEFINITION macro is useless after JDK-8269122

[Tobias Hartmann]

After [JDK-8269122](https://bugs.openjdk.java.net/browse/JDK-8269122) (https://github.com/openjdk/jdk/commit/4d2412ef3e1068063acc954a00b4db0fa4b5affb), `REGISTER_DEFINITION` is empty and should be removed together with the files using it.

Thanks,
Tobias

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Commit messages:
 - 8282085: The REGISTER_DEFINITION macro is useless after JDK-8269122

Changes: https://git.openjdk.java.net/jdk/pull/7528/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7528&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8282085
  Stats: 531 lines in 6 files changed: 0 ins; 529 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7528.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7528/head:pull/7528

PR: https://git.openjdk.java.net/jdk/pull/7528