Example: all the operands of `shape.broadcast` are empty tensors.
```
func.func @all_empty(%arg0: tensor<f32>) -> tensor<0xindex> {
%1 = shape.shape_of %arg0 : tensor<f32> -> tensor<0xindex>
%2 = shape.const_shape [] : tensor<0xindex>
%3 = shape.broadcast %1, %2, %1 : tensor<0xindex>, tensor<0xindex>, tensor<0xindex> -> tensor<0xindex>
return %3 : tensor<0xindex>
}
```
One can reproduce crash when canonicalize with *down-top* order, cmd
like this:
`mlir-opt -split-input-file -allow-unregistered-dialect
-canonicalize="test-convergence top-down=0" %s`
The root cause is when all operands are empty tensor,
`RemoveEmptyShapeOperandsPattern` would filter out all operands.
Co-authored-by: Kai Sasaki <lewuathe@gmail.com>
1e18815fdc