[cleanup] use namespaces in C++ code, in particular drcachesim
This is proposing adopting general principles of using namespaces in our C++ code (particularly drcachesim, our biggest C++ project) for better name isolation and organization.
This is proposing adopting general principles of using namespaces in our C++ code (particularly drcachesim, our biggest C++ project) for better name isolation and organization.