[aarch64-port-dev ] Aarch64: fix client jvm build failure

[Kavitha Natarajan]

Hi,

The OpenJDK build for client JVM on aarch64 fails due to compilation
errors. This error shows up after the backport of JDK-8130150 (Implement
BigInteger.montgomeryMultiply intrinsic) to Java 8.

There is no bug id available right now. As I don't have access to open a
bug, please help me opening a bug in bugs.openjdk.java.net.

Also, please review the following changeset that fixes the issue:

http://people.linaro.org/~kavitha.natarajan/LEG347

Make the Montgomery implementation C2 specific so that client build is not
affected.

Thanks & Regards,
Kavitha Natarajan
Member Engineer,
Linaro Enterprise Group