// Returns true if the given instruction is an mlir::TF::LegacyCallOp or the
// result of such an operation transformed by the
// ExecutorToControlDialectConversion pass.
//
// TODO(b/145706023): When the ExecutorToControlDialectConversion pass runs
// before the exporter, it mutates an mlir::TF::LegacyCallOp instruction to
// an instruction with a different operation name. As such, this routine checks