xls example: mux1to2_xls.tgz

[ray ic]

Share the multi-channel verilog generation example I get today. I meet a include file loop issue:  xls_int.h need to include ac_int.h, but ac_int.h(under ac_compat directory) need to include xls_int.h. So I git clone the hlslibs/ac_types.git  as the ac_datatypes.

For convenience, I  put all ac_datatype libraries in my working directory.