Fix arch_helper() to return the list of supported architectures.

llvm-svn: 157643
diff --git a/lldb/source/Core/StreamString.cpp b/lldb/source/Core/StreamString.cpp
index e4caef8..1c6f146 100644
--- a/lldb/source/Core/StreamString.cpp
+++ b/lldb/source/Core/StreamString.cpp
@@ -47,6 +47,12 @@
     m_packet.clear();
 }
 
+bool
+StreamString::Empty() const
+{
+    return GetSize() == 0;
+}
+
 const char *
 StreamString::GetData () const
 {