Move JIT listener C binding fallbackks to ExecutionEngineBindings.cpp.

Initially, in https://reviews.llvm.org/D44890, I had these defined as
empty functions inside the header when the respective event listener
was not built in. As done in that commit, that wasn't correct, because
it was a ODR violation.  Krasimir hot-fixed that in r333265, but that
wasn't quite right either, because it'd lead to the symbol not being
available.

Instead just move the fallbacksto ExecutionEngineBindings.cpp. Could
define them as static inlines in the header too, but I don't think it
matters.

Reviewers: whitequark

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D49654

llvm-svn: 337930

llvm/include/llvm/ExecutionEngine/JITEventListener.h

@@ -134,16 +134,4 @@ DEFINE_SIMPLE_CONVERSION_FUNCTIONS(JITEventListener, LLVMJITEventListenerRef)
 
 } // end namespace llvm
 
-#ifndef LLVM_USE_INTEL_JITEVENTS
-LLVMJITEventListenerRef LLVMCreateIntelJITEventListener(void);
-#endif
-
-#ifndef LLVM_USE_OPROFILE
-LLVMJITEventListenerRef LLVMCreateOProfileJITEventListener(void);
-#endif
-
-#ifndef LLVM_USE_PERF
-LLVMJITEventListenerRef LLVMCreatePerfJITEventListener(void);
-#endif
-
 #endif // LLVM_EXECUTIONENGINE_JITEVENTLISTENER_H

llvm/lib/ExecutionEngine/ExecutionEngineBindings.cpp

@@ -14,6 +14,7 @@
 #include "llvm-c/ExecutionEngine.h"
 #include "llvm/ExecutionEngine/ExecutionEngine.h"
 #include "llvm/ExecutionEngine/GenericValue.h"
+#include "llvm/ExecutionEngine/JITEventListener.h"
 #include "llvm/ExecutionEngine/RTDyldMemoryManager.h"
 #include "llvm/IR/DerivedTypes.h"
 #include "llvm/IR/Module.h"
@@ -411,3 +412,26 @@ void LLVMDisposeMCJITMemoryManager(LLVMMCJITMemoryManagerRef MM) {
   delete unwrap(MM);
 }
 
+/*===-- JIT Event Listener functions -------------------------------------===*/
+
+
+#if !LLVM_USE_INTEL_JITEVENTS
+LLVMJITEventListenerRef LLVMCreateIntelJITEventListener(void)
+{
+  return nullptr;
+}
+#endif
+
+#if !LLVM_USE_OPROFILE
+LLVMJITEventListenerRef LLVMCreateOProfileJITEventListener(void)
+{
+  return nullptr;
+}
+#endif
+
+#if !LLVM_USE_PERF
+LLVMJITEventListenerRef LLVMCreatePerfJITEventListener(void)
+{
+  return nullptr;
+}
+#endif