`alloc-variant-zeroed` causing issues with LTO

[clubby789]

I believe this causing https://crbug.com/441524277. In summary, the rust calloc function _RNvCsfo6nMSlQo1l_7___rustc19___rust_alloc_zeroed definition does not have the alloc-family attribute, but user modules of it have the alloc-family attribute on the calloc declaration. however, if ThinLTO decides to import the function, we lose the alloc-family attribute and the verifier complains 'alloc-variant-zeroed' must name a function belonging to the same 'alloc-family'.

Originally posted by @aeubanks in #144086 (comment)