cpu-o3: fix path history info target

- Align target generation in `getPHistInfo` with `getTarget`

Change-Id: I3cf46388e19780eccbaa80656db2f74652b97677

Author: Erlkonigal

src/cpu/pred/btb/common.hh

@@ -650,8 +650,20 @@ struct FullBTBPrediction
                 } else {
                     // uncond
                     taken = true;
-                    pc = entry.pc; // get the pc of the cond branch
+                    pc = entry.pc; // get the pc of the uncond branch
                     target = entry.target;
+                    // indirect target should come from ipred or ras,
+                    // or btb itself when ipred miss
+                    if (entry.isIndirect) {
+                        if (!entry.isReturn) { // normal indirect, see ittage
+                            auto it = IndirectTakens_find(indirectTargets, pc);
+                            if (it != indirectTargets.end()) { // found in ittage, use it
+                                target = it->second;
+                            }
+                        } else { // indirect return, use RAS target
+                            target = returnTarget;
+                        }
+                    } // else: normal taken, use btb target
                     break;
                 }
             }