[SYCL][NVPTX] Emit reqd_work_group_size attributes as NVVM annotations#14502

sommerlukas merged 3 commits intointel:syclintel/llvm:syclfrom

frasercrmck:sycl-nvptx-reqd-wg-sizefrasercrmck/llvm:sycl-nvptx-reqd-wg-sizeCopy head branch name to clipboard