[OpenMP][NFC] Remove unused (un)register_lib plugin API

These APIs have not been hooked up for a while. No need to carry them.

Author: jdoerfert

openmp/libomptarget/include/rtl.h

@@ -56,7 +56,6 @@ struct RTLInfoTy {
   typedef int64_t(init_requires_ty)(int64_t);
   typedef int32_t(synchronize_ty)(int32_t, __tgt_async_info *);
   typedef int32_t(query_async_ty)(int32_t, __tgt_async_info *);
-  typedef int32_t (*register_lib_ty)(__tgt_bin_desc *);
   typedef int32_t(supports_empty_images_ty)();
   typedef void(print_device_info_ty)(int32_t);
   typedef void(set_info_flag_ty)(uint32_t);
@@ -111,8 +110,6 @@ struct RTLInfoTy {
   init_requires_ty *init_requires = nullptr;
   synchronize_ty *synchronize = nullptr;
   query_async_ty *query_async = nullptr;
-  register_lib_ty register_lib = nullptr;
-  register_lib_ty unregister_lib = nullptr;
   supports_empty_images_ty *supports_empty_images = nullptr;
   set_info_flag_ty *set_info_flag = nullptr;
   print_device_info_ty *print_device_info = nullptr;

openmp/libomptarget/src/interface.cpp

@@ -45,13 +45,6 @@ EXTERN void __tgt_register_lib(__tgt_bin_desc *Desc) {
   if (PM->maybeDelayRegisterLib(Desc))
     return;
 
-  for (auto &RTL : PM->RTLs.AllRTLs) {
-    if (RTL.register_lib) {
-      if ((*RTL.register_lib)(Desc) != OFFLOAD_SUCCESS) {
-        DP("Could not register library with %s", RTL.RTLName.c_str());
-      }
-    }
-  }
   PM->RTLs.registerLib(Desc);
 }
 
@@ -64,13 +57,6 @@ EXTERN void __tgt_init_all_rtls() { PM->RTLs.initAllRTLs(); }
 EXTERN void __tgt_unregister_lib(__tgt_bin_desc *Desc) {
   TIMESCOPE();
   PM->RTLs.unregisterLib(Desc);
-  for (auto &RTL : PM->RTLs.UsedRTLs) {
-    if (RTL->unregister_lib) {
-      if ((*RTL->unregister_lib)(Desc) != OFFLOAD_SUCCESS) {
-        DP("Could not register library with %s", RTL->RTLName.c_str());
-      }
-    }
-  }
 }
 
 template <typename TargetAsyncInfoTy>

openmp/libomptarget/src/rtl.cpp

@@ -215,10 +215,6 @@ bool RTLsTy::attemptLoadRTL(const std::string &RTLName, RTLInfoTy &RTL) {
       DynLibrary->getAddressOfSymbol("__tgt_rtl_data_exchange_async");
   *((void **)&RTL.is_data_exchangable) =
       DynLibrary->getAddressOfSymbol("__tgt_rtl_is_data_exchangable");
-  *((void **)&RTL.register_lib) =
-      DynLibrary->getAddressOfSymbol("__tgt_rtl_register_lib");
-  *((void **)&RTL.unregister_lib) =
-      DynLibrary->getAddressOfSymbol("__tgt_rtl_unregister_lib");
   *((void **)&RTL.supports_empty_images) =
       DynLibrary->getAddressOfSymbol("__tgt_rtl_supports_empty_images");
   *((void **)&RTL.set_info_flag) =

openmp/libomptarget/tools/kernelreplay/llvm-omp-kernel-replay.cpp

@@ -195,9 +195,5 @@ int main(int argc, char **argv) {
 
   delete[] recored_data;
 
-  // TODO: calling unregister lib causes plugin deinit error for nextgen
-  // plugins.
-  //__tgt_unregister_lib(&Desc);
-
   return 0;
 }