RFR[12] JDK-8179098 "Crypto AES/ECB encryption/decryption performance regression (introduced in jdk9b73)"

[Valerie Peng]

Hi Tony,

Would you have time to review this? Instead of doing the bounds check 
per block, the changes move the bounds check up one level.

Bug: https://bugs.openjdk.java.net/browse/JDK-8179098

Webrev: http://cr.openjdk.java.net/~valeriep/8179098/webrev.00/

Thanks,
Valerie