Merge pull request The-OpenROAD-Project#8293 from luis201420/ant_check_special_nets_issue

ANT: avoid checking the positioning of special nets

Author: eder-matheus

src/ant/src/AntennaChecker.cc

@@ -1098,9 +1098,15 @@ bool AntennaChecker::designIsPlaced()
     }
   }
 
-  for (odb::dbInst* inst : block_->getInsts()) {
-    if (!inst->isPlaced()) {
-      return false;
+  for (odb::dbNet* net : block_->getNets()) {
+    if (net->isSpecial()) {
+      continue;
+    }
+    for (odb::dbITerm* iterm : net->getITerms()) {
+      odb::dbInst* inst = iterm->getInst();
+      if (!inst->isPlaced()) {
+        return false;
+      }
     }
   }