For backward compatibility with old, buggy GCC, Apple uses a different register
numbering scheme for the eh_frame section.

See, for reference, the comments near the top of this file from LLDB's source:
https://github.com/llvm-mirror/lldb/blob/release_36/source/Plugins/Process/Utility/RegisterContext_x86.h

From: Michael Müller <michael@fds-team.de>

Also lock/unlock the module only on creation/destruction of the object.

Also lock/unlock the module only on creation/destruction of the object.