[XLA] Adapt HLO pipeline to scalar-index DS and DUS
This and adapts HLO to work with the scalar DynamicSlice / DynamicUpdateSlice form. This means it also effectively switches the backends to use the new form. Also a bunch of test churn - tests that don't run optimizations (and, hence, don't trigger the splitter pass) needed to be converted. PiperOrigin-RevId: 227908542
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