GOTCHA + Kokkos + tasking + more (#47)

* GOTCHA + Kokkos + tasking + more

- update gotcha with fix for dlsym(RTLD_NEXT, ...)
- support for standalone KOKKOS_PROFILE_LIBRARY
- remove extra flags for omnitrace-user
- roctracer and critical_trace namespaces in tasking
- generic tasking functions, e.g. join(), shutdown(), etc.
- omnitrace_init_tooling_hidden in api.hpp
- ompt.cpp uses OMNITRACE_USE_OMPT
- kokkosp uses user_region instead of omnitrace component
- re-enable recycling thread ids
- more generic _{push,pop}_perfetto functors
- fix for thread_data::instance(construct_on_init, ...)
- fix for omnitrace-headers interface target
- omnitrace_watch_for_change

source/lib/omnitrace/include/library/thread_data.hpp

@@ -134,8 +134,8 @@ template <typename... Args>
 typename thread_data<Tp, Tag, MaxThreads>::instance_array_t&
 thread_data<Tp, Tag, MaxThreads>::instances(construct_on_init, Args&&... _args)
 {
-    static auto _v = [&]() {
-        auto _internal = instance_array_t{};
+    static auto& _v = [&]() -> instance_array_t& {
+        auto& _internal = instances();
         for(size_t i = 0; i < MaxThreads; ++i)
             _internal.at(i) = unique_ptr_t<Tp>{ new Tp(std::forward<Args>(_args)...) };
         return _internal;