Move Log from Core -> Utility.

All references to Host and Core have been removed, so this
class can now safely be lowered into Utility.

Differential Revision: https://reviews.llvm.org/D30559

llvm-svn: 296909
diff --git a/lldb/source/Plugins/Process/Utility/HistoryThread.cpp b/lldb/source/Plugins/Process/Utility/HistoryThread.cpp
index d27a7b0..4983dcd 100644
--- a/lldb/source/Plugins/Process/Utility/HistoryThread.cpp
+++ b/lldb/source/Plugins/Process/Utility/HistoryThread.cpp
@@ -13,9 +13,9 @@
 #include "Plugins/Process/Utility/HistoryUnwind.h"
 #include "Plugins/Process/Utility/RegisterContextHistory.h"
 
-#include "lldb/Core/Log.h"
 #include "lldb/Target/Process.h"
 #include "lldb/Target/StackFrameList.h"
+#include "lldb/Utility/Log.h"
 
 using namespace lldb;
 using namespace lldb_private;