Fix ambiguity in data_type.
Fix ambiguity in data_type.

svstuff/systemverilog,svstuff/systemverilog,vaisup/systemverilog-1,spookysys/systemverilog,vaisup/systemverilog-1,svstuff/systemverilog,vaisup/systemverilog-1,svstuff/systemverilog,spookysys/systemverilog,svstuff/systemverilog,vaisup/systemverilog-1,svstuff/systemverilog,spookysys/systemverilog,vaisup/systemverilog-1,svstuff/systemverilog,vaisup/systemverilog-1,spookysys/systemverilog,spookysys/systemverilog,spookysys/systemverilog,vaisup/systemverilog-1,spookysys/systemverilog