[mlir] `transform.include` does not handle nested specs with the same name

[kuhar]

Repro:

// RUN: mlir-opt %s --transform-interpreter

module @td_module_4 attributes {transform.with_named_sequence} {
  module @foo_module attributes {transform.with_named_sequence} {
    transform.named_sequence @__transform_main(%arg0: !transform.any_op {transform.readonly}) -> () {
      transform.print {name="foo_module"}
      transform.yield
    }
  }
  module @bar_module attributes {transform.with_named_sequence} {
    transform.named_sequence @__transform_main(%arg0: !transform.any_op {transform.readonly}) -> () {
      transform.print {name="bar_module"}
      transform.yield
    }
  }
  transform.named_sequence @__transform_main(%arg0: !transform.any_op {transform.readonly}) -> () {
    transform.include @foo_module::@__transform_main failures(suppress) (%arg0) : (!transform.any_op) -> ()
    transform.include @bar_module::@__transform_main failures(suppress) (%arg0) : (!transform.any_op) -> ()
    transform.yield
  }
}

This prints [[[ IR printer: foo_module top-level ]]] only but I'd expect it to also print [[[ IR printer: bar_module top-level ]]].

If I rename the nested specs to __transform_main1 and __transform_main2, both foo_module and bar_module get printed.

[llvmbot]

@llvm/issue-subscribers-bug

Author: Jakub Kuderski (kuhar)

Repro: ```mlir // RUN: mlir-opt %s --transform-interpreter

module @td_module_4 attributes {transform.with_named_sequence} {
module @foo_module attributes {transform.with_named_sequence} {
transform.named_sequence @__transform_main(%arg0: !transform.any_op {transform.readonly}) -> () {
transform.print {name="foo_module"}
transform.yield
}
}
module @bar_module attributes {transform.with_named_sequence} {
transform.named_sequence @__transform_main(%arg0: !transform.any_op {transform.readonly}) -> () {
transform.print {name="bar_module"}
transform.yield
}
}
transform.named_sequence @__transform_main(%arg0: !transform.any_op {transform.readonly}) -> () {
transform.include @foo_module::@__transform_main failures(suppress) (%arg0) : (!transform.any_op) -> ()
transform.include @bar_module::@__transform_main failures(suppress) (%arg0) : (!transform.any_op) -> ()
transform.yield
}
}

This prints `[[[ IR printer: foo_module top-level ]]]` only but I'd expect it to also print `[[[ IR printer: bar_module top-level ]]]`.

If I rename the nested specs to `__transform_main1` and `__transform_main2`, both `foo_module` and `bar_module` get printed.
</details>