[mlir][complex] Sanity check for tan operation in complex dialect

[Lewuathe]

Summary

Add a sanity check for newly added tan operation in complex dialect. It follows-up to https://reviews.llvm.org/D126685.

[pifon2a]

@Lewuathe could you also add an integration test for tanh to correctness.mlir? I don't think that lit tests are particularly useful for convert-to-standard pass.

[Lewuathe]

Sure, let me work on that.

mlir/test/Dialect/Complex/ops.mlir

func.func @ops(%f: f32) {
   %sqrt = complex.sqrt %complex : complex<f32>
 
   // CHECK: complex.rsqrt %[[C]] : complex<f32>
   %rsqrt = complex.rsqrt %complex : complex<f32>
 
   // CHECK: complex.atan2 %[[C]], %[[C]] : complex<f32>
   %atan2 = complex.atan2 %complex, %complex : complex<f32>
 
+  // CHECK: complex.tan %[[C]] : complex<f32>
+  %tan = complex.tan %complex : complex<f32>
+
   return
 }