add few more tests

tests/arch/nanoxplore/mux.ys

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+read_verilog ../common/mux.v
+design -save read
+
+hierarchy -top mux2
+proc
+equiv_opt -assert -map +/nanoxplore/cells_sim.v synth_nanoxplore # equivalency check
+design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
+cd mux2 # Constrain all select calls below inside the top module
+select -assert-count 1 t:NX_LUT
+
+select -assert-none t:NX_LUT %% t:* %D
+
+design -load read
+hierarchy -top mux4
+proc
+equiv_opt -assert -map +/nanoxplore/cells_sim.v synth_nanoxplore # equivalency check
+design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
+cd mux4 # Constrain all select calls below inside the top module
+#select -assert-count 2 t:NX_LUT
+
+select -assert-none t:NX_LUT %% t:* %D
+
+design -load read
+hierarchy -top mux8
+proc
+equiv_opt -assert -map +/nanoxplore/cells_sim.v synth_nanoxplore # equivalency check
+design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
+cd mux8 # Constrain all select calls below inside the top module
+#select -assert-count 5 t:NX_LUT
+
+select -assert-none t:NX_LUT %% t:* %D
+
+design -load read
+hierarchy -top mux16
+proc
+equiv_opt -assert -map +/nanoxplore/cells_sim.v synth_nanoxplore # equivalency check
+design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
+cd mux16 # Constrain all select calls below inside the top module
+select -assert-max 13 t:NX_LUT
+
+select -assert-none t:NX_LUT %% t:* %D

tests/arch/nanoxplore/tribuf.ys

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+read_verilog ../common/tribuf.v
+hierarchy -top tristate
+proc
+tribuf
+flatten
+synth
+equiv_opt -assert -map +/nanoxplore/cells_sim.v -map +/simcells.v synth_nanoxplore # equivalency check
+design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
+cd tristate # Constrain all select calls below inside the top module
+#Internal cell type used. Need support it.
+select -assert-count 1 t:$_TBUF_
+select -assert-none t:$_TBUF_ %% t:* %D