[mlir][scf] WhileOp patterns cleanup
Fix review comments from https://reviews.llvm.org/D146252 Merge `WhileRemoveUnusedArgs` pattern with (unused) `WhileUnusedArg`, use `getConditionOp`, use `SmallPtrSet` and early check, move tests Differential Revision: https://reviews.llvm.org/D148256
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684914f4
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