Convert Platform, Process, and Connection functions to StringRef.

All tests pass on Linux and Windows.

llvm-svn: 287259
diff --git a/lldb/source/Commands/CommandObjectTarget.cpp b/lldb/source/Commands/CommandObjectTarget.cpp
index a695589..d36adb4 100644
--- a/lldb/source/Commands/CommandObjectTarget.cpp
+++ b/lldb/source/Commands/CommandObjectTarget.cpp
@@ -377,7 +377,7 @@
             target_sp->GetExecutableSearchPaths().Append(core_file_dir);
 
             ProcessSP process_sp(target_sp->CreateProcess(
-                m_interpreter.GetDebugger().GetListener(), nullptr,
+                m_interpreter.GetDebugger().GetListener(), llvm::StringRef(),
                 &core_file));
 
             if (process_sp) {