Translate MIR to clif ir in parallel with parallel rustc #1489
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On dev-desktop the advantage of cg_clif over cg_llvm on simple-raytracer is 15% when parallel rustc is disabled. With -Zthreads=16 the advantage goes from 5% to 22% with this change.
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On dev-desktop the advantage of cg_clif over cg_llvm on simple-raytracer is 15% when parallel rustc is disabled. With -Zthreads=16 the advantage goes from 5% to 22% with this change.
Fixes #1423