Properly lower div.scalar and div.tensor #6338

Job	Run time
Build XLA / build	1h 1m 46s
Build & publish docs	0s
GPU tests / test (benchmark_tests)	12m 10s
GPU tests / test (cpp_tests1)	17m 5s
GPU tests / test (cpp_tests2)	25m 58s
GPU tests / test (python_tests, xla_op1)	1h 10m 27s
CPU tests / test (benchmark_tests)	10m 1s
GPU tests / test (python_tests, xla_op2)	45m 35s
CPU tests / test (cpp_tests1)	14m 25s
GPU tests / test (python_tests, xla_op3)	48m 56s
CPU tests / test (cpp_tests2)	16m 33s
GPU tests / test (python_tests, torch_mp_op)	1h 36m 6s
CPU tests / test (python_tests, xla_op1)	19m 30s
CPU tests / test (python_tests, xla_op2)	9m 52s
CPU tests / test (python_tests, xla_op3)	11m 44s
CPU tests / test (python_tests, torch_mp_op)	24m 58s
	8h 5m 6s

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