Enable more Linux aarch64 PTRACE support for local and remote debugging.

See http://reviews.llvm.org/D4803 for more details.

Change by Paul Osmialowski.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@216185 91177308-0d34-0410-b5e6-96231b3b80d8