llvmPackages: Organize files

Always do pkg/default.nix not pkg.nix; use directories to avoid
prefixing patches and other files.

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

@@ -28,12 +28,12 @@ in rec {
     src = "${src}/clang";
   };
 
-  lld = callPackage ./lld.nix {
+  lld = callPackage ./lld {
     inherit llvm version;
     src = "${src}/lld";
   };
 
-  llvm = callPackage ./llvm.nix {
+  llvm = callPackage ./llvm {
     inherit version;
     src = "${src}/llvm";
   };

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

@@ -57,8 +57,8 @@ in stdenv.mkDerivation rec {
   ];
 
   postPatch = ''
-    substitute '${./llvm-outputs.patch}' ./llvm-outputs.patch --subst-var lib
-    patch -p1 < ./llvm-outputs.patch
+    substitute '${./outputs.patch}' ./outputs.patch --subst-var lib
+    patch -p1 < ./outputs.patch
   '';
 
   # hacky fix: created binaries need to be run before installation