[flang-commits] [flang] [flang] [mlir] Avoid clobbering mlir-tblgen target by defining dummy imported targets (PR #150987)

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Acture wrote:

> Would appreciate it if someone from the MLIR or Flang team could take a look. @llvm/pr-subscribers-mlir

@katrak  @akuhlens @DanielCChen @eugeneepshteyn 
Sorry for the direct ping. Not sure if tag works—please let me know if there's a more appropriate reviewer.

https://github.com/llvm/llvm-project/pull/150987