rsz: Preserve old flag and token for backward compatibility

Signed-off-by: Eren Dogan <erendogan@google.com>

Author: erendn

src/rsz/src/Resizer.cc

@@ -6083,7 +6083,7 @@ MoveType Resizer::moveTypeFromString(const std::string& s)
   if (lower == "sizeup") {
     return MoveType::kSizeUp;
   }
-  if (lower == "size_down_fanout") {
+  if (lower == "size_down_fanout" || lower == "size_down") {
     return MoveType::kSizeDownFanout;
   }
   if (lower == "clone") {

src/rsz/src/Resizer.tcl

@@ -244,7 +244,7 @@ sta::define_cmd_args "repair_timing" {[-setup] [-hold]\
                                         [-phases phases]\
                                         [-skip_pin_swap]\
                                         [-skip_gate_cloning]\
-                                        [-skip_size_down_fanout]\
+                                        [-skip_size_down]\
                                         [-skip_buffering]\
                                         [-skip_buffer_removal]\
                                         [-skip_last_gasp]\
@@ -269,7 +269,7 @@ proc repair_timing { args } {
             -phases -policy -policies \
             -recover_power -repair_tns -max_passes -max_iterations -max_repairs_per_pass} \
     flags {-setup -hold -allow_setup_violations -skip_pin_swap -skip_gate_cloning \
-             -skip_size_down_fanout -skip_buffering -skip_buffer_removal -skip_last_gasp \
+             -skip_size_down -skip_buffering -skip_buffer_removal -skip_last_gasp \
              -skip_vt_swap -skip_crit_vt_swap -match_cell_footprint -verbose}
 
   set setup [info exists flags(-setup)]
@@ -319,7 +319,7 @@ proc repair_timing { args } {
   set allow_setup_violations [info exists flags(-allow_setup_violations)]
   set skip_pin_swap [info exists flags(-skip_pin_swap)]
   set skip_gate_cloning [info exists flags(-skip_gate_cloning)]
-  set skip_size_down_fanout [info exists flags(-skip_size_down_fanout)]
+  set skip_size_down_fanout [info exists flags(-skip_size_down)]
   set skip_buffering [info exists flags(-skip_buffering)]
   set skip_buffer_removal [info exists flags(-skip_buffer_removal)]
   set skip_last_gasp [info exists flags(-skip_last_gasp)]