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dd6e4a9206
Unify LLVM ctlz/cttz intrinsic generation The type signature for `llvm.ctlz` is the same as the one for `llvm.cttz`, which enables a small simplification.
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.