llvm: fix heavily parallel builds

pkgs/development/compilers/llvm/default.nix

@@ -10,8 +10,10 @@ stdenv.mkDerivation rec {
     sha256 = "0y3mfbb5qzcpw3v5qncn69x1hdrrrfirgs82ypi2annhf0g6nxk8";
   };
 
-  # The default rlimits are too low for shared libraries.
-  patches = [ ./more-memory-for-bugpoint.patch ];
+  patches = [
+    ./more-memory-for-bugpoint.patch # The default rlimits are too low for shared libraries.
+    ./no-rule-aarch64.patch # http://llvm.org/bugs/show_bug.cgi?id=16625
+  ];
 
   # libffi was propagated before, but it wasn't even being used, so
   # unless something needs it just an input is fine.

pkgs/development/compilers/llvm/no-rule-aarch64.patch

@@ -0,0 +1,8 @@
+--- llvm/lib/Target/AArch64/Utils/CMakeLists.txt	2013/05/18 04:32:15	182189
++++ llvm/lib/Target/AArch64/Utils/CMakeLists.txt	2013/05/18 08:17:47	182190
+@@ -3,3 +3,5 @@
+ add_llvm_library(LLVMAArch64Utils
+   AArch64BaseInfo.cpp
+   )
++
++add_dependencies(LLVMAArch64Utils AArch64CommonTableGen)