[jdk11u-dev] RFR: 8248403: AArch64: Remove uses of kernel integer types

[Paul Hohensee]

Backport applies cleanly net of context differences. Testing: tier1.

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Commit messages:
 - Backport 6a91c73dda1cb197d74f0cb3b491d9c47f4bb40c

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/246/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=246&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8248403
  Stats: 104 lines in 7 files changed: 1 ins; 0 del; 103 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/246.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/246/head:pull/246

PR: https://git.openjdk.java.net/jdk11u-dev/pull/246