Move RegisterValue,Scalar,State from Core to Utility

These three classes have no external dependencies, but they are used
from various low-level APIs. Moving them down to Utility improves
overall code layering (although it still does not break any particular
dependency completely).

The XCode project will need to be updated after this change.

Differential Revision: https://reviews.llvm.org/D49740

llvm-svn: 339127
diff --git a/lldb/source/Target/ThreadPlan.cpp b/lldb/source/Target/ThreadPlan.cpp
index 31ee1e9..7aa4b47 100644
--- a/lldb/source/Target/ThreadPlan.cpp
+++ b/lldb/source/Target/ThreadPlan.cpp
@@ -13,12 +13,12 @@
 // Project includes
 #include "lldb/Target/ThreadPlan.h"
 #include "lldb/Core/Debugger.h"
-#include "lldb/Core/State.h"
 #include "lldb/Target/Process.h"
 #include "lldb/Target/RegisterContext.h"
 #include "lldb/Target/Target.h"
 #include "lldb/Target/Thread.h"
 #include "lldb/Utility/Log.h"
+#include "lldb/Utility/State.h"
 
 using namespace lldb;
 using namespace lldb_private;