[SYCL] Move SYCLLowerWGLocalMemoryPass to PipelineStart #16183
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The pass transforms __sycl_allocateLocalMemory call to access of global variable @WGLocalMem. Move the transform to beginning of the pipeline since the access could enable more optimization than the function call.
In addition, intel gpu compiler has a pass to transform global variable in addrspace(3) to alloca that runs after pipeline basic simplification. Therefore, we shall run SYCLLowerWGLocalMemoryPass ealier.