Description of changes

In addition to patch updates, other commits have been applied to follow the upstream changes:

• libgcc{,_s} is no longer explicitly linked against after llvm/llvm-project@a4336f2.
• compiler-rt/lib/builtins/cpu_model.c has been moved to compiler-rt/lib/builtins/cpu_model/x86.c in llvm/llvm-project@025d048.
• LIBCXXABI_USE_LLVM_UNWINDER is now on by default ([runtimes] Use LLVM libunwind from libc++abi by default llvm/llvm-project#77687).

Also, llvm/llvm-project@48e5b5e breaks the libcxxabi/libunwind separation in Nixpkgs when useLLVM = true, and is therefore reverted.

Tested by:

• Building llvmPackages_git on x86_64-linux, aarch64-linux, aarch64-darwin, plus building and running hello with llvmPackages_git.stdenv.
• Building llvmPackages_git.llvm on x86_64-darwin.
• Building and running pkgsLLVM.hello with llvmPackages_git on x86_64-linux.
• Building pkgsStatic.llvmPackages_git.clang and pkgsCross.wasi32.llvmPackages_git.libcxx with ofborg.

Things done

• 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:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• 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/)
• 24.05 Release Notes (or backporting 23.05 and 23.11 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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