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The test relies on the fact that inlining more than 2^12 calls at the same callsite will trigger a panic (and after the following commit, a warning) due to LLVM limitations but with collapse_debuginfo the callsites should not be the same.
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.