All path groups (#215)

* All path groups

* Fixes

* Use c++17 iteration

test/path_group_names.ok

@@ -0,0 +1,2 @@
+Initial path groups: 
+Final path groups: In2Out In2Reg Reg2Out Reg2Reg

test/path_group_names.tcl

@@ -0,0 +1,14 @@
+# path_group_names
+
+read_liberty asap7_small.lib.gz
+read_verilog reg1_asap7.v
+link_design top
+create_clock -name clk -period 500 {clk1 clk2 clk3}
+set_input_delay -clock clk 0 [all_inputs -no_clocks]
+set_output_delay -clock clk 0 [all_outputs]
+puts "Initial path groups: [sta::path_group_names]"
+group_path -name In2Reg -from [all_inputs] -to [all_registers -data_pins]
+group_path -name In2Out -from [all_inputs] -to [all_outputs]
+group_path -name Reg2Out -from [all_registers -clock_pins] -to [all_outputs]
+group_path -name Reg2Reg -from [all_registers -clock_pins] -to [all_registers -data_pins]
+puts "Final path groups: [sta::path_group_names]"

test/regression_vars.tcl

@@ -147,6 +147,7 @@ record_sta_tests {
   liberty_arcs_one2one_2
   liberty_ccsn
   liberty_latch3
+  path_group_names
   prima3
   report_checks_src_attr
   report_json1