Move collect_and_partition_mono_items to rustc_mir

[bjorn3]

Most of the logic of it is inside rustc_mir anyway.

Also removes the single function crate rustc_metadata_utils. Based on #55225

[rust-highfive]

r? @oli-obk

(rust_highfive has picked a reviewer for you, use r? to override)

[oli-obk]

r=me with nit fixed

[oli-obk]

@bors r+

[bors]

📌 Commit adafd0f has been approved by oli-obk

[bjorn3]

Should I close #55225?

[oli-obk]

idk what the rules are. These PRs are probably going to get rolled up anyway

[bjorn3]

Will close it, so that the first commit doesn't get included twice (that commit is a rebase of the other pr)

[bors]

🔒 Merge conflict

This pull request and the master branch diverged in a way that cannot be automatically merged. Please rebase on top of the latest master branch, and let the reviewer approve again.

How do I rebase?

Assuming self is your fork and upstream is this repository, you can resolve the conflict following these steps:

1. git checkout rustc_mir_collect_and_partition_mono_items(switch to your branch)
2. git fetch upstream master(retrieve the latest master)
3. git rebase upstream/master -p(rebase on top of it)
4. Follow the on-screen instruction to resolve conflicts (check git status if you got lost).
5. git push self rustc_mir_collect_and_partition_mono_items --force-with-lease(update this PR)

You may also read Git Rebasing to Resolve Conflicts by Drew Blessing for a short tutorial.

Please avoid the "Resolve conflicts" button on GitHub. It uses git merge instead of git rebase which makes the PR commit history more difficult to read.

Sometimes step 4 will complete without asking for resolution. This is usually due to difference between how Cargo.lock conflict is handled during merge and rebase. This is normal, and you should still perform step 5 to update this PR.

Error message

warning: Cannot merge binary files: src/Cargo.lock (HEAD vs. heads/homu-tmp)
Auto-merging src/librustc_mir/monomorphize/partitioning.rs
Auto-merging src/librustc_mir/lib.rs
Removing src/librustc_metadata_utils/lib.rs
Removing src/librustc_metadata_utils/Cargo.toml
Auto-merging src/librustc_codegen_utils/symbol_export.rs
Auto-merging src/librustc_codegen_utils/linker.rs
Auto-merging src/librustc_codegen_utils/link.rs
Auto-merging src/librustc_codegen_llvm/base.rs
Auto-merging src/Cargo.lock
CONFLICT (content): Merge conflict in src/Cargo.lock
Automatic merge failed; fix conflicts and then commit the result.

[bors]

☔ The latest upstream changes (presumably #55238) made this pull request unmergeable. Please resolve the merge conflicts.

[bjorn3]

Rebased

[oli-obk]

@bors r+

[bors]

📌 Commit 9e479c2 has been approved by oli-obk

[bors]

⌛ Testing commit 9e479c2 with merge ac70882...

[bors]

☀️ Test successful - status-appveyor, status-travis
Approved by: oli-obk
Pushing ac70882 to master...