Commits on Oct 6, 2021

1. Enable AutoFDO. …

   This largely involves implementing the options debug-info-for-profiling
   and profile-sample-use and forwarding them on to LLVM.
   
   AutoFDO can be used on x86-64 Linux like this:
   rustc -O -Cdebug-info-for-profiling main.rs -o main
   perf record -b ./main
   create_llvm_prof --binary=main --out=code.prof
   rustc -O -Cprofile-sample-use=code.prof main.rs -o main2
   
   Now `main2` will have feedback directed optimization applied to it.
   
   The create_llvm_prof tool can be obtained from this github repository:
   https://github.com/google/autofdo
   
   Fixes rust-lang#64892.

   

   mikebenfield committed Oct 6, 2021
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