RFR: 8248403: AArch64: Remove uses of kernel integer types

[Andrew Haley]

In several places the AArch64 back end uses integer types from the kernel such as u_int32_t rather than the standard C type uint64_t. These should be removed.

http://cr.openjdk.java.net/~aph/8248403/

-- 
Andrew Haley  (he/him)
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
https://keybase.io/andrewhaley
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