[Torch] Add patterns to convert complex conversions to bitcasts #15558

Job	Run time
setup / setup	7s
Build Packages / Linux Release (x86_64)	7m 35s
Test AMD MI250 / test_mi250	5m 55s
Unit Test / Linux (x86_64)	2m 52s
Regression Test / test_regression_suite :: cpu_llvm_task	10m 36s
Regression Test / test_models :: cpu_llvm_task	4m 22s
Regression Test / test_regression_suite :: amdgpu_rocm_mi250_gfx90a	9m 36s
Test AMD MI300 / test_mi300	9m 18s
Test AMD W7900 / test_w7900	1m 48s
Regression Test / test_models :: amdgpu_rocm_mi250_gfx90a	8m 14s
Regression Test / test_regression_suite :: amdgpu_rocm_mi300_gfx942	7m 15s
Regression Test / test_models :: amdgpu_rocm_mi300_gfx942	4m 33s
Regression Test / test_models :: amdgpu_vulkan	1m 36s
Test Android / android_arm64	5m 50s
Test ONNX / test_onnx_models :: cpu_llvm_task	10m 37s
Test PJRT plugin / Build and test (ubuntu-20.04, cpu)	3m 42s
Test ONNX / test_onnx_ops :: cpu_llvm_sync	4m 11s
Test RISC-V 64 / riscv64	5m 45s
Test ONNX / test_onnx_ops :: amdgpu_rocm_rdna3	8m 54s
Test ONNX / test_onnx_ops :: amdgpu_vulkan	1m 46s
Test Sharktank / test_sharktank_models :: cpu_llvm_task	24s
Test TensorFlow / Linux (x86_64)	1m 21s
	1h 56m 17s

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