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

…ntElimination

ArgumentPromotion and DeadArgumentElimination passes could change
function signatures but the function name remains the same as before the
transformation. This makes it hard for tracing with bpf programs where
user tends to use function signature in the source. See discussion [1]
for details.

This patch added suffix to functions whose signatures are changed. The
suffix lets users know that function signature has changed and they need
to impact the IR or binary to find modified signature before tracing
those functions.

The suffix for ArgumentPromotion is ".argprom" and the suffixes for
DeadArgumentElimination are ".argelim" and ".retelim". The suffix also
gives user hints about what kind of transformation has been done.

With this patch, I built a recent linux kernel with full LTO enabled. I
got 4 functions with only argpromotion like
```
  set_track_update.argelim.argprom
  pmd_trans_huge_lock.argprom
  ...
```
I got 1058 functions with only deadargelim like
```
  process_bit0.argelim
  pci_io_ecs_init.argelim
  ...
```
I got 3 functions with both argpromotion and deadargelim
```
  set_track_update.argelim.argprom
  zero_pud_populate.argelim.argprom
  zero_pmd_populate.argelim.argprom
```

  [1] https://github.com/llvm/llvm-project/issues/104678

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