A dynamic library for profiling allocations in an application

It does this by loading a library dynamically, without any need to instrument the application itself.

On MacOS:

$ DYLD_INSERT_LIBRARIES=libmemprofile.dylib ./a.out

On Linux

$ LD_PRELOAD=libmemprofile.dylib ./a.out

And the output will look like this:

$ DYLD_INSERT_LIBRARIES=libmemprofile.dylib ./a.out
Memory used: 
   Total:   512 bytes in 2 allocation(s)
   At exit: 0 bytes in 0 allocation(s)

Currently only tested on MacOS

Currently, in my examples, there's always an initial realloc call of 256 bytes. I haven't traced the location of this call yet, please let me know if you know where it comes from :)