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/Expression/UserExpression.cpp b/lldb/source/Expression/UserExpression.cpp
index 17b5fbb..c7cf106 100644
--- a/lldb/source/Expression/UserExpression.cpp
+++ b/lldb/source/Expression/UserExpression.cpp
@@ -17,7 +17,6 @@
 #include <string>
 
 #include "Plugins/ExpressionParser/Clang/ClangPersistentVariables.h"
-#include "lldb/Core/Log.h"
 #include "lldb/Core/Module.h"
 #include "lldb/Core/StreamFile.h"
 #include "lldb/Core/ValueObjectConstResult.h"
@@ -42,6 +41,7 @@
 #include "lldb/Target/ThreadPlan.h"
 #include "lldb/Target/ThreadPlanCallUserExpression.h"
 #include "lldb/Utility/ConstString.h"
+#include "lldb/Utility/Log.h"
 #include "lldb/Utility/StreamString.h"
 
 using namespace lldb_private;