RFR: 8260928: InitArrayShortSize constraint func should print a helpful error message

[Tobias Hartmann]

The `InitArrayShortSize` flag requires a value that is a multiple of `BytesPerLong` but no corresponding error message is printed:
java -XX:InitArrayShortSize=7
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

Thanks,
Tobias

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Commit messages:
 - 8260928: InitArrayShortSize constraint func should print a helpful error message

Changes: https://git.openjdk.java.net/jdk/pull/2351/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2351&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8260928
  Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2351.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2351/head:pull/2351

PR: https://git.openjdk.java.net/jdk/pull/2351