Provide half floating point support as a storage only type.
Lack of half FP was a regression compared to llvm-gcc.

llvm-svn: 142016
diff --git a/clang/lib/CodeGen/CGRTTI.cpp b/clang/lib/CodeGen/CGRTTI.cpp
index dbf99fa..fbdb298 100644
--- a/clang/lib/CodeGen/CGRTTI.cpp
+++ b/clang/lib/CodeGen/CGRTTI.cpp
@@ -185,6 +185,7 @@
     case BuiltinType::ULong:
     case BuiltinType::LongLong:
     case BuiltinType::ULongLong:
+    case BuiltinType::Half:
     case BuiltinType::Float:
     case BuiltinType::Double:
     case BuiltinType::LongDouble: