[llvm] [ArgPromotion] Handle pointer arguments of recursive calls (PR #78735)

[Vedant Paranjape via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
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vedantparanjape-amd wrote:

makes sense, I will add testcase for these two cases:

1) check for argument position of the caller and callee.
2) check if the pointer offset is non-zero

lmk, if I need to add anything more.

https://github.com/llvm/llvm-project/pull/78735