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
diff --git a/lldb/tools/lldb-platform/lldb-platform.cpp b/lldb/tools/lldb-platform/lldb-platform.cpp
index e18ebab..96aa0fb 100644
--- a/lldb/tools/lldb-platform/lldb-platform.cpp
+++ b/lldb/tools/lldb-platform/lldb-platform.cpp
@@ -286,7 +286,7 @@
                     bool done = false;
                     while (!interrupt && !done)
                     {
-                        if (!gdb_server.GetPacketAndSendResponse (UINT32_MAX, error, interrupt, done))
+                        if (gdb_server.GetPacketAndSendResponse (UINT32_MAX, error, interrupt, done) != GDBRemoteCommunication::PacketResult::Success)
                             break;
                     }