[lldb] Remove YAMLTraits.h include (NFC)

The YAML functionality was dropped in
70599d7, but this include was
left behind.

Author: nikic

lldb/include/lldb/Target/Thread.h

@@ -26,6 +26,7 @@
 #include "lldb/Utility/UnimplementedError.h"
 #include "lldb/Utility/UserID.h"
 #include "lldb/lldb-private.h"
+#include "llvm/Support/MemoryBuffer.h"
 
 #define LLDB_THREAD_MAX_STOP_EXC_DATA 8
 

lldb/include/lldb/Utility/Args.h

@@ -13,8 +13,8 @@
 #include "lldb/lldb-private-types.h"
 #include "lldb/lldb-types.h"
 #include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/StringExtras.h"
 #include "llvm/ADT/StringRef.h"
-#include "llvm/Support/YAMLTraits.h"
 #include <string>
 #include <utility>
 #include <vector>