Don't compute inlining status of mono items in advance.

We record inlining status for mono items in `MonoItems`, and then
transfer it to `InliningMap`, for later use in
`InliningMap::with_inlining_candidates`.

But we can just compute inlining status directly in
`InliningMap::with_inlining_candidates`, because the mono item is right
there. There's no need to compute it in advance.

This commit changes the code to do that, removing the need for
`MonoItems` and `InliningMap::inlines`. This does result in more calls
to `instantiation_mode` (one per static occurrence) but the performance
effect is negligible.

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