diff --git a/clang/utils/TableGen/ClangOpenCLBuiltinEmitter.cpp b/clang/utils/TableGen/ClangOpenCLBuiltinEmitter.cpp
--- a/clang/utils/TableGen/ClangOpenCLBuiltinEmitter.cpp
+++ b/clang/utils/TableGen/ClangOpenCLBuiltinEmitter.cpp
@@ -751,9 +751,7 @@
   }
 
   // End of switch statement.
-  OS << "    default:\n"
-     << "      llvm_unreachable(\"OpenCL builtin type not handled yet\");\n"
-     << "  } // end of switch (Ty.ID)\n\n";
+  OS << "  } // end of switch (Ty.ID)\n\n";
 
   // Step 2.
   // Add ExtVector types if this was a generic type, as the switch statement