Function mi_realloc_aligned_at 

pub unsafe extern "C" fn mi_realloc_aligned_at(
    p: *mut c_void,
    newsize: usize,
    alignment: usize,
    offset: usize,
) -> *mut c_void

Re-allocate memory to newsize bytes aligned by alignment at a specified offset.

This is a realloc equivalent of mi_malloc_aligned_at.