[llvm] [Transforms][IPO] Add func suffix in ArgumentPromotion and DeadArgume… (PR #105742)

[via llvm-commits]

================
@@ -61,7 +61,7 @@
 ; RUN:  -o %t.out 2>&1 | FileCheck %s --check-prefix=DUMP \
 ; RUN:  --check-prefix=STATS --check-prefix=STATS-BE --check-prefix=REMARKS
 
-; RUN: llvm-dis %t.out.1.4.opt.bc -o - | FileCheck %s --check-prefix=IR
+; RUN: llvm-dis %t.out.1.4.opt.bc -o - | FileCheck %s --check-prefix=IRNODIST
----------------
yonghong-song wrote:

> Why name change does not happen with distributed thinLTO?

This is due to the following code in llvm/tools/llvm-lto2/llvm-lto2.cpp:
```
  if (ThinLTODistributedIndexes)
    Backend = createWriteIndexesThinBackend(/*OldPrefix=*/"",
                                            /*NewPrefix=*/"",
                                            /*NativeObjectPrefix=*/"",
                                            ThinLTOEmitImports,
                                            /*LinkedObjectsFile=*/nullptr,
                                            /*OnWrite=*/{});
  else
    Backend = createInProcessThinBackend(
        llvm::heavyweight_hardware_concurrency(Threads),
        /* OnWrite */ {}, ThinLTOEmitIndexes, ThinLTOEmitImports);
```

If ThinLTODistributedIndexes is true,  createWriteIndexesThinBackend() is called which did not trigger DeadArgElimination pass.

https://github.com/llvm/llvm-project/pull/105742