Add OpenCL samplers as Clang builtin types and check sampler related restrictions.

llvm-svn: 174601
diff --git a/clang/lib/CodeGen/CGRTTI.cpp b/clang/lib/CodeGen/CGRTTI.cpp
index 366ce29..869843c 100644
--- a/clang/lib/CodeGen/CGRTTI.cpp
+++ b/clang/lib/CodeGen/CGRTTI.cpp
@@ -197,6 +197,7 @@
     case BuiltinType::OCLImage2d:
     case BuiltinType::OCLImage2dArray:
     case BuiltinType::OCLImage3d:
+    case BuiltinType::OCLSampler:
     case BuiltinType::OCLEvent:
       return true;