Add lldb-gdbserver support for Linux x86_64.

This change brings in lldb-gdbserver (llgs) specifically for Linux x86_64.
(More architectures coming soon).

Not every debugserver option is covered yet.  Currently
the lldb-gdbserver command line can start unattached,
start attached to a pid (process-name attach not supported yet),
or accept lldb attaching and launching a process or connecting
by process id.

The history of this large change can be found here:
https://github.com/tfiala/lldb/tree/dev-tfiala-native-protocol-linux-x86_64

Until mid/late April, I was not sharing the work and continued
to rebase it off of head (developed via id tfiala@google.com).  I switched over to
user todd.fiala@gmail.com in the middle, and once I went to github, I did
merges rather than rebasing so I could share with others.

llvm-svn: 212069

lldb/source/Core/ModuleList.cpp

@@ -1003,6 +1003,7 @@ ModuleList::GetSharedModule
             file_spec.GetPath(path, sizeof(path));
             if (path[0] == '\0')
                 module_file_spec.GetPath(path, sizeof(path));
+            // How can this check ever be true? This branch it is false, and we haven't modified file_spec.
             if (file_spec.Exists())
             {
                 std::string uuid_str;