[PTX] Intrinsics for async copy from global to shared (SM80)#11368
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…11368) * registor ptx builtin for async copy * add basic codegen * add test * update codegen * wip * codegen bug fixed, test working * add commit group * add doc
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See https://docs.nvidia.com/cuda/parallel-thread-execution/index.html#data-movement-and-conversion-instructions-cp-async-wait-group
More configurable options can be considered, but this is a good start.
@junrushao1994 @vinx13 @Hzfengsy @yzh119