Fix JacobiSVD for complex when the complex-to-real update already gives a diagonal 2x2 block.
Fix JacobiSVD for complex when the complex-to-real update already gives a diagonal 2x2 block.

ROCmSoftwarePlatform/hipeigen,pasuka/eigen,ritsu1228/eigen,ROCmSoftwarePlatform/hipeigen,ROCmSoftwarePlatform/hipeigen,ritsu1228/eigen,pasuka/eigen,ritsu1228/eigen,pasuka/eigen,ROCmSoftwarePlatform/hipeigen,pasuka/eigen,ritsu1228/eigen,ritsu1228/eigen,pasuka/eigen