[ORC][examples] Export exectuable symbols explicitly in LLJITWithExecutorProcessControl

Functions in static code that should be callable from JITed code must be exported. For dynamic libraries extern functions are exported by default. For exectuables, linkers usually strip them away unless we explicitly ask for keeping them.

Reviewed By: xgupta

Differential Revision: https://reviews.llvm.org/D110345

llvm/examples/OrcV2Examples/LLJITWithExecutorProcessControl/CMakeLists.txt

@@ -10,3 +10,5 @@ set(LLVM_LINK_COMPONENTS
 add_llvm_example(LLJITWithExecutorProcessControl
   LLJITWithExecutorProcessControl.cpp
   )
+
+export_executable_symbols(LLJITWithExecutorProcessControl)