Patch for "process load" by Filipe Cabecinhas.

Filipe was attempting to do a:

(lldb) process load ~/path/foo.dylib

But the process load command wasn't resolving the path. We have to be careful
about resolving the path here because we want to do it in terms of the platform
we are using. the "~/" can mean a completely different path if you are remotely
debugging on another machine as another user. So to support this, platforms now
can resolve remote paths:

bool
Platform::ResolveRemotePath (const FileSpec &platform_path,
                             FileSpec &resolved_platform_path);

The host/local platform will just resolve the path.
                             

llvm-svn: 137307