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758a904764
coverage: Extract safe FFI wrapper functions to `llvm_cov` This PR takes all of the inline `unsafe` calls in coverage codegen, and all the safe wrapper functions in `coverageinfo/mod.rs`, and moves them to a new `llvm_cov` submodule that is dedicated to safe FFI wrapper functions. This reduces the mixing of abstraction levels in the rest of coverage codegen. As a follow-up, this PR also tidies up the names and signatures of several of the coverage FFI functions.