From Matt Thomas: use long long for [u]int64_t and [u]intmax_t on
NetBSD/aarch64 to simplify code sharing with NetBSD/arm.


git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@204798 91177308-0d34-0410-b5e6-96231b3b80d8