llvm: add patch for f6fca6f

Author: bluerise

contrib/llvm/patches/llvm_20150502a_neon.diff

@@ -0,0 +1,30 @@
+commit f6fca6f4d4241d2624759734c6b91e42e4f7bf22
+Author: Patrick Wildt <patrick@blueri.se>
+Date:   Sat May 2 21:12:49 2015 +0200
+
+    llvm: disable NEON on ARM targets
+    
+    The Marvell Armada XP does not have NEON/SIMD. Our default target
+    defaults to using NEON, so we have to disable this.
+    
+    It's more of a workaround, I'm not happy with it, but there's not
+    really a better way.
+
+diff --git a/contrib/llvm/tools/clang/lib/Driver/Tools.cpp b/contrib/llvm/tools/clang/lib/Driver/Tools.cpp
+index a1c6bee..e69c8c2 100644
+--- a/contrib/llvm/tools/clang/lib/Driver/Tools.cpp
++++ b/contrib/llvm/tools/clang/lib/Driver/Tools.cpp
+@@ -730,6 +730,13 @@ static void getARMTargetFeatures(const Driver &D, const llvm::Triple &Triple,
+       Features.push_back("+soft-float-abi");
+   }
+ 
++  /* Disable NEON on Bitrig unless overridden. */
++  if (Triple.getOS() == llvm::Triple::Bitrig &&
++      !Args.getLastArg(options::OPT_mfpu_EQ)) {
++    Features.push_back("+vfp3");
++    Features.push_back("-neon");
++  }
++
+   // Honor -mfpu=.
+   if (const Arg *A = Args.getLastArg(options::OPT_mfpu_EQ))
+     getARMFPUFeatures(D, A, Args, Features);