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60ca9b6e29
Use decision context stack to handle nested decisions: - Introduce MCDCDecisionCtx - Use a stack of MCDCDecisionCtx to handle nested decisions
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.