fix warning from external header (llvm#1135)

Excluded a header file from warnings.

Signed-off-by: ian Bearman <[email protected]>
Co-authored-by: Alexandre Eichenberger <[email protected]>

Author: manbearian

src/Runtime/PyExecutionSession.cpp

@@ -13,7 +13,11 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "src/Support/SuppressWarnings.h"
+
+SUPPRESS_WARNINGS_PUSH
 #include "onnx/onnx_pb.h"
+SUPPRESS_WARNINGS_POP
 
 #include "PyExecutionSession.hpp"