Move Broadcaster+Listener+Event combo from Core into Utility

Summary:
These are general purpose "utility" classes, whose functionality is not
debugger-specific in any way. As such, I believe they belong in the
Utility module.

This doesn't break any particular dependency (yet), but it reduces the
number of Core dependencies across the board.

Reviewers: zturner, jingham, teemperor, clayborg

Subscribers: mgorny, lldb-commits

Differential Revision: https://reviews.llvm.org/D55361

llvm-svn: 349157

lldb/source/API/SBEvent.cpp

@@ -12,11 +12,11 @@
 #include "lldb/API/SBStream.h"
 
 #include "lldb/Breakpoint/Breakpoint.h"
-#include "lldb/Core/Event.h"
 #include "lldb/Core/StreamFile.h"
 #include "lldb/Interpreter/CommandInterpreter.h"
 #include "lldb/Target/Process.h"
 #include "lldb/Utility/ConstString.h"
+#include "lldb/Utility/Event.h"
 #include "lldb/Utility/Stream.h"
 
 using namespace lldb;