[CodeGen] Use a range-based for loop (NFC) (#104408)

Author: kazutakahirata

llvm/lib/CodeGen/CodeGenPrepare.cpp

@@ -7382,12 +7382,9 @@ bool CodeGenPrepare::tryToSinkFreeOperands(Instruction *I) {
     if (IsHugeFunc) {
       // Now we clone an instruction, its operands' defs may sink to this BB
       // now. So we put the operands defs' BBs into FreshBBs to do optimization.
-      for (unsigned I = 0; I < NI->getNumOperands(); ++I) {
-        auto *OpDef = dyn_cast<Instruction>(NI->getOperand(I));
-        if (!OpDef)
-          continue;
-        FreshBBs.insert(OpDef->getParent());
-      }
+      for (Value *Op : NI->operands())
+        if (auto *OpDef = dyn_cast<Instruction>(Op))
+          FreshBBs.insert(OpDef->getParent());
     }
 
     NewInstructions[UI] = NI;