This PR is to fix https://github.com/llvm/llvm-project/issues/118011 by emitting OpConstant instead of OpConstantNull to conform to NonSemantic.Shader.DebugInfo.100 DebugTypeBasic's flags definition.
This PR is to fix https://github.com/llvm/llvm-project/issues/118011 by emitting OpConstant instead of OpConstantNull to conform to NonSemantic.Shader.DebugInfo.100 DebugTypeBasic's flags definition.