RFR: 8312147: Dynamic Exception Specification warnings are no longer required after JDK-8311380

[Julian Waters]

After [JDK-8311380](https://bugs.openjdk.org/browse/JDK-8311380), the dynamic exception specification warning pragma can be removed

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Commit messages:
 - 8312147: Dynamic Exception Specification warnings are no longer required after JDK-8311380

Changes: https://git.openjdk.org/jdk/pull/14899/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14899&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8312147
  Stats: 6 lines in 1 file changed: 0 ins; 6 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/14899.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14899/head:pull/14899

PR: https://git.openjdk.org/jdk/pull/14899