[Hexagon] Fix -Wuninitialized warning (llvm#125565)

`gcc (GCC) 14.2.1 20240910` reports the warning below on the baseline,
this change fixes the warning.

In file included from
/home/user/CLionProjects/llvm-project/llvm/lib/Target/Hexagon/BitTracker.cpp:55:

/home/user/CLionProjects/llvm-project/llvm/lib/Target/Hexagon/BitTracker.h:
In constructor ‘llvm::BitTracker::UseQueueType::UseQueueType()’:

/home/user/CLionProjects/llvm-project/llvm/lib/Target/Hexagon/BitTracker.h:75:27:
warning: member ‘llvm::BitTracker::UseQueueType::Dist’ is used
uninitialized [-Wuninitialized]
       75 |     UseQueueType() : Uses(Dist) {}
          |                           ^~~~

Fixes llvm#125545

Author: androm3da

llvm/lib/Target/Hexagon/BitTracker.h

@@ -100,9 +100,9 @@ struct BitTracker {
       bool operator()(const MachineInstr *MI, const MachineInstr *MJ) const;
       DenseMap<const MachineInstr*,unsigned> &Dist;
     };
-    std::priority_queue<MachineInstr*, std::vector<MachineInstr*>, Cmp> Uses;
     DenseSet<const MachineInstr*> Set; // Set to avoid adding duplicate entries.
     DenseMap<const MachineInstr*,unsigned> Dist;
+    std::priority_queue<MachineInstr *, std::vector<MachineInstr *>, Cmp> Uses;
   };
 
   void reset();