llvmPackages: Always put `libunwind` before `openmp`

This keeps the "main bootstrap" together.

pkgs/development/compilers/llvm/10/default.nix

@@ -188,13 +188,12 @@ let
         libunwind = libraries.libunwind;
       }));
 
-    openmp = callPackage ./openmp.nix {};
-
     libunwind = callPackage ./libunwind ({} //
       (lib.optionalAttrs (stdenv.hostPlatform.useLLVM or false) {
         stdenv = overrideCC stdenv buildLlvmTools.lldClangNoLibcxx;
       }));
 
+    openmp = callPackage ./openmp.nix {};
   });
 
 in { inherit tools libraries; } // libraries // tools

pkgs/development/compilers/llvm/11/default.nix

@@ -189,13 +189,12 @@ let
         libunwind = libraries.libunwind;
       }));
 
-    openmp = callPackage ./openmp.nix {};
-
     libunwind = callPackage ./libunwind ({} //
       (lib.optionalAttrs (stdenv.hostPlatform.useLLVM or false) {
         stdenv = overrideCC stdenv buildLlvmTools.lldClangNoLibcxx;
       }));
 
+    openmp = callPackage ./openmp.nix {};
   });
 
 in { inherit tools libraries; } // libraries // tools

pkgs/development/compilers/llvm/12/default.nix

@@ -236,7 +236,6 @@ let
     });
 
     openmp = callPackage ./openmp { inherit llvm_meta; };
-
   });
 
 in { inherit tools libraries; } // libraries // tools

pkgs/development/compilers/llvm/8/default.nix

@@ -191,13 +191,12 @@ let
         libunwind = libraries.libunwind;
       }));
 
-    openmp = callPackage ./openmp.nix {};
-
     libunwind = callPackage ./libunwind ({} //
       (lib.optionalAttrs (stdenv.hostPlatform.useLLVM or false) {
         stdenv = overrideCC stdenv buildLlvmTools.lldClangNoLibcxx;
       }));
 
+    openmp = callPackage ./openmp.nix {};
   });
 
 in { inherit tools libraries; } // libraries // tools

pkgs/development/compilers/llvm/9/default.nix

@@ -191,13 +191,12 @@ let
         libunwind = libraries.libunwind;
       }));
 
-    openmp = callPackage ./openmp.nix {};
-
     libunwind = callPackage ./libunwind ({} //
       (lib.optionalAttrs (stdenv.hostPlatform.useLLVM or false) {
         stdenv = overrideCC stdenv buildLlvmTools.lldClangNoLibcxx;
       }));
 
+    openmp = callPackage ./openmp.nix {};
   });
 
 in { inherit tools libraries; } // libraries // tools