abde9ba527
- Rename `create_size_estimate` as `compute_size_estimate`, because that makes more sense for the second and subsequent calls for each CGU. - Change `CodegenUnit::size_estimate` from `Option<usize>` to `usize`. We can still assert that `compute_size_estimate` is called first. - Move the size estimation for `place_mono_items` inside the function, for consistency with `merge_codegen_units`.