RFR: 8314045: ArithmeticException in GaloisCounterMode

[Liam Miller-Cushon]

Please consider this fix for [JDK-8314045](https://bugs.openjdk.org/browse/JDK-8314045), which adds a missing size check to avoid an `ArithmeticException` in `GaloisCounterMode`.

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Commit messages:
 - 8314045: ArithmeticException in GaloisCounterMode

Changes: https://git.openjdk.org/jdk/pull/15212/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15212&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8314045
  Stats: 65 lines in 2 files changed: 65 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/15212.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15212/head:pull/15212

PR: https://git.openjdk.org/jdk/pull/15212