(DRAFT) Combined draft branch for coverage work#115428

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Zalathar wants to merge 13 commits intorust-lang:masterfrom

Zalathar:coverage

Commits on Oct 21, 2023

coverage: Emit mappings for unused functions without generating stubs
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coverage: Move unused-function helpers closer to where they are used
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coverage: Change query `codegened_and_inlined_items` to a plain function
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coverage: Force `-Copt-level=2` in the unreachable-code test
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coverage: Repair instrumented functions that have lost all their counters
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Allow MIR pass `UnreachableProp` when coverage is enabled
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coverage: Split `FunctionCoverage` into distinct collector/finished phases
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coverage: Fetch expressions and mappings separately
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coverage: Build the global file table ahead of time
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coverage: Encapsulate local-to-global file mappings
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coverage: Encode function mappings without re-sorting them
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coverage: Emit the filenames section before encoding per-function mappings
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coverage: Consolidate creation of `__llvm_covmap` records
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