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

[Eli Friedman 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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efriedma-quic wrote:

You can probably put all the testcases in one file.

In terms of what to test... non-zero offsets, functions containing both recursive and non-recursive calls, a struct with multiple elements.

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