[llvm-profgen] Fix a typo in collectProfiledFunctions

[hoy]

Summary

As titled. The change should have minimal impact since the targets of branch samples are mostly covered by range samples.

[wenlei]

good catch!

[wlei]

Good catch!

llvm/tools/llvm-profgen/ProfileGenerator.cpp

for (const auto &CI : *SampleCounters) {
     for (auto Item : CI.second.RangeCounter) {
       uint64_t StartAddress = Item.first.first;
       if (FuncRange *FRange = Binary->findFuncRange(StartAddress))
         ProfiledFunctions.insert(FRange->Func);
     }
 
     for (auto Item : CI.second.BranchCounter) {
       uint64_t SourceAddress = Item.first.first;
-      uint64_t TargetAddress = Item.first.first;
+      uint64_t TargetAddress = Item.first.second;
       if (FuncRange *FRange = Binary->findFuncRange(SourceAddress))
         ProfiledFunctions.insert(FRange->Func);
       if (FuncRange *FRange = Binary->findFuncRange(TargetAddress))
         ProfiledFunctions.insert(FRange->Func);
     }
   }
   return true;
 }