[SYCL] Reduce branching in `parallel_for_lambda_impl`#20198

AlexeySachkov wants to merge 1 commit intointel:syclintel/llvm:syclfrom

AlexeySachkov:private/asachkov/handler-hpp-cleanupAlexeySachkov/llvm:private/asachkov/handler-hpp-cleanupCopy head branch name to clipboard