[Hexagon] Use range-based for loops (NFC) (#104538)

Author: kazutakahirata

llvm/lib/Target/Hexagon/HexagonCopyHoisting.cpp

@@ -249,9 +249,7 @@ void HexagonCopyHoisting::moveCopyInstr(MachineBasicBlock *DestBB,
   DestBB->splice(FirstTI, MI->getParent(), MI);
 
   addMItoCopyList(MI);
-  for (auto I = std::next(DestBB->succ_begin()), E = DestBB->succ_end(); I != E;
-       ++I) {
-    MachineBasicBlock *SuccBB = *I;
+  for (MachineBasicBlock *SuccBB : drop_begin(DestBB->successors())) {
     auto &BBCopyInst = CopyMIList[SuccBB->getNumber()];
     MachineInstr *SuccMI = BBCopyInst[Key];
     SuccMI->eraseFromParent();

llvm/lib/Target/Hexagon/HexagonGenMemAbsolute.cpp

@@ -86,11 +86,9 @@ bool HexagonGenMemAbsolute::runOnMachineFunction(MachineFunction &Fn) {
       getAnalysis<MachineDominatorTreeWrapperPass>().getDomTree();
 
   // Loop over all of the basic blocks
-  for (MachineFunction::iterator MBBb = Fn.begin(), MBBe = Fn.end();
-       MBBb != MBBe; ++MBBb) {
-    MachineBasicBlock *MBB = &*MBBb;
+  for (MachineBasicBlock &MBB : Fn) {
     // Traverse the basic block
-    for (MachineBasicBlock::iterator MII = MBB->begin(); MII != MBB->end();
+    for (MachineBasicBlock::iterator MII = MBB.begin(); MII != MBB.end();
          ++MII) {
       MachineInstr *MI = &*MII;
       int Opc = MI->getOpcode();
@@ -205,7 +203,7 @@ bool HexagonGenMemAbsolute::runOnMachineFunction(MachineFunction &Fn) {
 
       LLVM_DEBUG(dbgs() << "Replaced with " << *MIB << "\n");
       // Erase the instructions that got replaced.
-      MII = MBB->erase(MI);
+      MII = MBB.erase(MI);
       --MII;
       NextMI->getParent()->erase(NextMI);
     }