Fix some -Wundef warnings in include/llvm/ExecutionEngine/JITEventListener.h

[tkelman]

Summary

This check was added in R152620, and has started causing downstream warnings in Julia:

In file included from /home/tkelman/Julia/julia-0.5/src/codegen.cpp:22:0:
/home/tkelman/Julia/julia-0.5/usr/include/llvm/ExecutionEngine/JITEventListener.h:84:5: warning: "LLVM_USE_INTEL_JITEVENTS" is not defined [-Wundef]
 #if LLVM_USE_INTEL_JITEVENTS
     ^
/home/tkelman/Julia/julia-0.5/usr/include/llvm/ExecutionEngine/JITEventListener.h:100:5: warning: "LLVM_USE_OPROFILE" is not defined [-Wundef]
 #if LLVM_USE_OPROFILE
     ^

[loladiro]

LGTM

llvm/trunk/include/llvm/ExecutionEngine/JITEventListener.h

public:
 
   /// NotifyFreeingObject - Called just before the memory associated with
   /// a previously emitted object is released.
   virtual void NotifyFreeingObject(const object::ObjectFile &Obj) {}
 
   // Get a pointe to the GDB debugger registration listener.
   static JITEventListener *createGDBRegistrationListener();
 
-#if LLVM_USE_INTEL_JITEVENTS
+#if defined(LLVM_USE_INTEL_JITEVENTS) && LLVM_USE_INTEL_JITEVENTS
   // Construct an IntelJITEventListener
   static JITEventListener *createIntelJITEventListener();
 
   // Construct an IntelJITEventListener with a test Intel JIT API implementation
   static JITEventListener *createIntelJITEventListener(
                                       IntelJITEventsWrapper* AlternativeImpl);
 #else
   static JITEventListener *createIntelJITEventListener() { return nullptr; }
 
   static JITEventListener *createIntelJITEventListener(
                                       IntelJITEventsWrapper* AlternativeImpl) {
     return nullptr;
   }
 #endif // USE_INTEL_JITEVENTS
 
-#if LLVM_USE_OPROFILE
+#if defined(LLVM_USE_OPROFILE) && LLVM_USE_OPROFILE
   // Construct an OProfileJITEventListener
   static JITEventListener *createOProfileJITEventListener();
 
   // Construct an OProfileJITEventListener with a test opagent implementation
   static JITEventListener *createOProfileJITEventListener(
                                       OProfileWrapper* AlternativeImpl);
 #else