Teach the Neon intrinsic generator to widen half-precision float types.
This isn't currently used for anything but I ran into it when experimenting
with some changes, and it might be useful in the future.

llvm-svn: 121911
diff --git a/llvm/utils/TableGen/NeonEmitter.cpp b/llvm/utils/TableGen/NeonEmitter.cpp
index 13bed47..4864db4 100644
--- a/llvm/utils/TableGen/NeonEmitter.cpp
+++ b/llvm/utils/TableGen/NeonEmitter.cpp
@@ -73,6 +73,8 @@
       return 'i';
     case 'i':
       return 'l';
+    case 'h':
+      return 'f';
     default: throw "unhandled type in widen!";
   }
   return '\0';