[llvm] Support non-malloc functions in malloc+memset->calloc fold (PR #138299)

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

The way to do this is probably to add an extra attribute along the lines of `"alloc-variant-zeroed"="calloc"`?

https://github.com/llvm/llvm-project/pull/138299