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8a454f8101
Avoid a couple of Symbol::as_str calls in cg_llvm This should improve performance a tiny bit. Also remove `Symbol::len` and make `SymbolIndex` private.
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.