[aarch64-port-dev ] RFR: JDK-8205004: AArch64: fix failures in jtreg ArraysEqCmpTest

[Joshua Zhu]

Hi,

Please review the following change.

Bug: https://bugs.openjdk.java.net/browse/JDK-8205004
Webrev: http://cr.openjdk.java.net/~zyao/8205004/

This bug causes three failures in Jtreg ArraysEqCmpTest. 
test ArraysEqCmpTest.testArray(byte[])
test ArraysEqCmpTest.testArray(unsigned byte[]) 
test ArraysEqCmpTest.testArray(char[])

Array length needs to be compared for short arrays.
Please see detailed description in JBS.

Best Regards,
Joshua