Fix integration tests after #120580 (math-polynomial-approx-avx2)

Author: norx1991

mlir/test/mlir-cpu-runner/X86Vector/math-polynomial-approx-avx2.mlir

@@ -2,6 +2,7 @@
 // RUN:               -convert-vector-to-scf                                   \
 // RUN:               -convert-scf-to-cf                                       \
 // RUN:               -convert-arith-to-llvm                                   \
+// RUN:               -convert-cf-to-llvm                                   \
 // RUN:               -convert-vector-to-llvm="enable-x86vector"               \
 // RUN:               -convert-math-to-llvm                                    \
 // RUN:               -convert-func-to-llvm                                    \