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coverage: Re-land "Enlarge empty spans during MIR instrumentation" This allows us to assume that coverage spans will only be discarded during codegen in very unusual situations. --- This seemingly-simple change has a rather messy history: - rust-lang/rust#140847 - rust-lang/rust#141650 - rust-lang/rust#144298 - rust-lang/rust#144480 Since then, a number of related changes have landed that should make it reasonable to try again: - rust-lang/rust#144530 - rust-lang/rust#144560 - rust-lang/rust#144616 In particular, we have multiple fixes/mitigations, and a confirmed regression test for the original bug that is not triggered by re-landing the changes in this PR.
The codegen crate contains the code to convert from MIR into LLVM IR,
and then from LLVM IR into machine code. In general it contains code
that runs towards the end of the compilation process.
For more information about how codegen works, see the rustc dev guide.