SimSYCL
                                
                                
                                
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                        Change the return type of named swizzles
This is the fourth and last part of a series of four pull requests addressing some SYCL clarifications for sycl::vec.
This pull request implements the behavior specified in https://github.com/KhronosGroup/SYCL-Docs/pull/672#issue-2715771214, which changes the return type of 1-element named swizzles to DataT &.