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135cd69b57
coverage: Prepare for upcoming changes to counter creation This is a collection of smaller changes to coverage instrumentation code that have been extracted from a larger PR that I'm still working on, in order to hopefully make review easier. Each individual change should hopefully be mostly self-explanatory. One of the big goals of the upcoming PR will be to defer certain parts of counter-creation until codegen, via the query system, so that ends up being a recurring theme in these changes. Several of the changes are follow-ups to #135481. There should be no observable change in compiler output.
For more information about how rustc works, see the rustc dev guide.