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llvmPackages.bolt: add experimental bolt hook #375435

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Things done

Experimental concept, this adds a hook which calls bolt on the installed binaries. The idea is this will optimize the installed binaries. We'll test with just hello however all packages can be tried by enabling useBolt when specifying the cross platform.

  • Built on platform(s)
    • x86_64-linux
    • aarch64-linux
    • x86_64-darwin
    • aarch64-darwin
  • For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
    • sandbox = relaxed
    • sandbox = true
  • Tested, as applicable:
  • Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
  • Tested basic functionality of all binary files (usually in ./result/bin/)
  • 25.05 Release Notes (or backporting 24.11 and 25.05 Release notes)
    • (Package updates) Added a release notes entry if the change is major or breaking
    • (Module updates) Added a release notes entry if the change is significant
    • (Module addition) Added a release notes entry if adding a new NixOS module
  • Fits CONTRIBUTING.md.

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6.topic: lib The Nixpkgs function library 6.topic: llvm/clang Issues related to llvmPackages, clangStdenv and related 6.topic: stdenv Standard environment 10.rebuild-darwin: 1-10 10.rebuild-linux: 1-10
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