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Jonathan Brouwer
a56e2d3037
Generate openmp metadata LLVM has an openmp-opt pass, which is part of the default O3 pipeline. The pass bails if we don't have a global called openmp, so let's generate it if people enable our experimental offload feature. openmp is a superset of the offload feature, so they share optimizations. In follow-up PRs I'll start verifying that LLVM optimizes Rust the way we want it. r? compiler
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.