[SYCL] Reduce branching in parallel_for_lambda_impl
#20198
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- SYCL 2020 is the oldest standard we support, so check `SYCL >= 2020` is always true, dropped the corresponding check; - Outlined calls repeated for both rounded and non-rounded paths into a common section; - Outlined `(void)` casts into a common section to reduce size of `#ifdef` branches for improved readability;
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SYCL >= 2020is always true, dropped the corresponding check;(void)casts into a common section to reduce size of#ifdefbranches for improved readability;Strictly speaking, the patch has a functional side effect: call to
processPropertiesis now hit always, but previously it could be missed if range rounded kernel is being used