[llvm] [OpenMPIRBuilder] Remove wrapper function in `createTask` (PR #67723)

[Johannes Doerfert via llvm-commits]

================
@@ -1736,18 +1718,28 @@ OpenMPIRBuilder::createTask(const LocationDescription &Loc,
 
     StaleCI->eraseFromParent();
 
-    // Emit the body for wrapper function
-    BasicBlock *WrapperEntryBB =
-        BasicBlock::Create(M.getContext(), "", WrapperFunc);
-    Builder.SetInsertPoint(WrapperEntryBB);
+    Builder.SetInsertPoint(TaskAllocaBB, TaskAllocaBB->begin());
     if (HasShareds) {
-      llvm::Value *Shareds =
-          Builder.CreateLoad(VoidPtr, WrapperFunc->getArg(1));
-      Builder.CreateCall(&OutlinedFn, {Shareds});
-    } else {
-      Builder.CreateCall(&OutlinedFn);
+      LoadInst *Shareds = Builder.CreateLoad(VoidPtr, OutlinedFn.getArg(1));
+      OutlinedFn.getArg(1)->replaceUsesWithIf(
+          Shareds, [Shareds](Use &U) { return U.getUser() != Shareds; });
+    }
+
+    // Replace kmpc_global_thread_num() calls with the global thread id
+    // argument.
+    OutlinedFn.getArg(0)->setName("global.tid");
+    FunctionCallee TIDRTLFn =
+        getOrCreateRuntimeFunctionPtr(OMPRTL___kmpc_global_thread_num);
+    for (Instruction &Inst : instructions(OutlinedFn)) {
+      CallInst *CI = dyn_cast<CallInst>(&Inst);
+      if (!CI)
+        continue;
+      if (CI->getCalledFunction() == TIDRTLFn.getCallee())
+        CI->replaceAllUsesWith(OutlinedFn.getArg(0));
----------------
jdoerfert wrote:

You should not do this patch up in the first place. We even have a pass later that does it (for parallel so far, I think). However, if you want to do it, don't iterate the instructions of Outlined, but iterate the uses of TIDRTLFn. 

https://github.com/llvm/llvm-project/pull/67723