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(#147198)
When debugging arm32 process on arm64 machine, arm64 lldb-server will
use `NativeRegisterContextLinux_arm`, but the server should keep using
64-bit ptrace commands for hardware watchpoint/breakpoint, even when
debugging a 32-bit tracee.
See:
https://github.com/torvalds/linux/commit/5d220ff9420f8b1689805ba2d938bedf9e0860a4
There have been many conditional compilation handling arm32 tracee on
arm64, but this one is missed out.
To reuse the 64-bit implementation, I separate the shared code from
`NativeRegisterContextLinux_arm64.cpp` to
`NativeRegisterContextLinux_arm64dbreg.cpp`, with other adjustments to
share data structures of debug registers.
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