Revert "[AMDGPU][LTO] Assume closed world after linking (#105845)" (#106000)

This reverts commit 33f3ebc.

Author: gandhi56

llvm/lib/Target/AMDGPU/AMDGPUAttributor.cpp

@@ -1066,10 +1066,6 @@ static bool runImpl(Module &M, AnalysisGetter &AG, TargetMachine &TM,
 
   Attributor A(Functions, InfoCache, AC);
 
-  LLVM_DEBUG(dbgs() << "Module " << M.getName() << " is "
-                    << (AC.IsClosedWorldModule ? "" : "not ")
-                    << "assumed to be a closed world.\n");
-
   for (Function &F : M) {
     if (F.isIntrinsic())
       continue;

llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp

@@ -760,12 +760,8 @@ void AMDGPUTargetMachine::registerPassBuilderCallbacks(PassBuilder &PB) {
         // module is partitioned for codegen.
         if (EnableLowerModuleLDS)
           PM.addPass(AMDGPULowerModuleLDSPass(*this));
-
-        if (EnableAMDGPUAttributor && Level != OptimizationLevel::O0) {
-          AMDGPUAttributorOptions Opts;
-          Opts.IsClosedWorld = true;
-          PM.addPass(AMDGPUAttributorPass(*this, Opts));
-        }
+        if (EnableAMDGPUAttributor && Level != OptimizationLevel::O0)
+          PM.addPass(AMDGPUAttributorPass(*this));
       });
 
   PB.registerRegClassFilterParsingCallback(