Fix if ITTAPI_SOURCE_DIR is not set

Author: Zentrik

llvm/lib/ExecutionEngine/Orc/TargetProcess/CMakeLists.txt

@@ -6,6 +6,9 @@ set(intel_jit_profiling )
 if( LLVM_USE_INTEL_JITEVENTS )
   set(intel_jit_profiling IntelJITProfiling)
   include_directories(${CMAKE_CURRENT_SOURCE_DIR}/../../IntelJITProfiling)
+  if(NOT DEFINED ITTAPI_SOURCE_DIR)
+      set(ITTAPI_SOURCE_DIR ${PROJECT_BINARY_DIR})
+  endif()
   include_directories(${ITTAPI_SOURCE_DIR}/ittapi/include/ )
 endif()