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42df0a580f
Remove `-Ztime` Because it has a lot of overlap with `-Ztime-passes` but is generally less useful. Plus some related cleanups. Best reviewed one commit at a time. r? `@davidtwco`
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.