This patch fixes: mlir/lib/Dialect/LLVMIR/IR/NVVMDialect.cpp:1136:3: error: default label in switch which covers all enumeration values [-Werror,-Wcovered-switch-default] mlir/lib/Dialect/LLVMIR/IR/NVVMDialect.cpp:1388:3: error: default label in switch which covers all enumeration values [-Werror,-Wcovered-switch-default]