[JIT] Add an out-of-line definition for the virtual destructor in

JITEventListener. This used to be in the old JIT (last line of the file)
and everyone just "happened" to pick it up from there. =/ Doh.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217073 91177308-0d34-0410-b5e6-96231b3b80d8

lib/ExecutionEngine/CMakeLists.txt

@@ -3,6 +3,7 @@
 add_llvm_library(LLVMExecutionEngine
   ExecutionEngine.cpp
   ExecutionEngineBindings.cpp
+  JITEventListener.cpp
   RTDyldMemoryManager.cpp
   TargetSelect.cpp
   )

lib/ExecutionEngine/JITEventListener.cpp

@@ -0,0 +1,15 @@
+//===-- JITEventListener.cpp ----------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ExecutionEngine/JITEventListener.h"
+
+using namespace llvm;
+
+// Out-of-line definition of the virtual destructor as this is the key function.
+JITEventListener::~JITEventListener() {}