Remove LLVM from overlay

This is temporary.

overlay/default.nix

@@ -29,49 +29,6 @@ in {
       null;
   });
 
-  llvmPackages = self.recurseIntoAttrs self.llvmPackages_8;
-
-  llvmPackages_8 = super.llvmPackages_8 // {
-
-    llvm = super.llvmPackages_8.llvm.overrideAttrs
-      (attrs: { patches = [ ./llvm.patch ]; });
-
-    compiler-rt = super.llvmPackages_8.compiler-rt.overrideAttrs
-      (attrs: { patches = attrs.patches ++ [ ./compiler-rt.patch ]; });
-
-    libcxxabi = (super.llvmPackages_8.libcxxabi.override {
-      enableShared = false;
-    }).overrideAttrs (attrs: {
-      postUnpack = attrs.postUnpack + ''
-        patch -p1 -d $(ls -d llvm-*) -i ${./llvm-genode.patch}
-      '';
-      cmakeFlags = attrs.cmakeFlags ++ (lib.optionals hasGenode [
-        "-DCMAKE_C_FLAGS=-nodefaultlibs"
-        "-DLIBCXXABI_USE_LLVM_UNWINDER=OFF"
-        "-DLIBCXXABI_ENABLE_THREADS=OFF"
-        "-DLIBCXXABI_BAREMETAL=ON"
-      ]);
-
-      installPhase = attrs.installPhase
-        + "install -m 644 ../include/*.h $out/include";
-    });
-
-    libcxx = (super.llvmPackages_8.libcxx.override {
-      enableShared = false;
-    }).overrideAttrs (attrs: {
-      patches = attrs.patches ++ (lib.optional hasGenode ./libc++.patch);
-      nativeBuildInputs = attrs.nativeBuildInputs
-        ++ [ super.buildPackages.python ];
-      cmakeFlags = attrs.cmakeFlags
-        ++ (lib.optional hasGenode "-DLIBCXX_ENABLE_THREADS=OFF");
-    });
-
-    clang-unwrapped = super.llvmPackages_8.clang-unwrapped.overrideAttrs
-      (attrs: {
-        patches = attrs.patches ++ [ ./clang.patch ];
-      });
-  };
-
   genodeHeaders = self.callPackage ./headers { };
 
   inherit genodelibc;

upstream/default.nix

@@ -7,7 +7,9 @@ nixpkgs.stdenv.mkDerivation {
   outputs = [ "out" "dev" ];
   version = "19.07";
 
-  LIBCXXABI = nixpkgs.libcxxabi;
+  LIBCXX = nixpkgs.llvmPackages.libcxx;
+  LIBCXXABI = nixpkgs.llvmPackages.libcxxabi;
+  LIBUNWIND = nixpkgs.llvmPackages.libunwind;
   HOST_LIBC = nixpkgs.buildPackages.glibc.dev;
 
   src = nixpkgs.fetchgit