[llvm] [RFC][Attributor] change argument privatization to size-based type selection (PR #181716)

[Jameson Nash via llvm-commits]

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vtjnash wrote:

Ah, that seems an important observation too. But I think that's an existing bug, not related to this PR. This pass may need to be checking for compatibility of the target machine string between the caller and callee, and refusing to perform this optimization pass on function pairs that may have different native ABI for the exact same types.

https://github.com/llvm/llvm-project/pull/181716