Fix variable naming style in PPCBoolRetToInt.cpp

Change loop variable 'i' to 'I' to conform to LLVM coding standards.
Variable names should start with an upper case letter according to
LLVM coding guidelines.
Fixed locations:
Lines 103-104: for loop variable and usage
Lines 257-258: for loop variable and usage

Author: Shuqi911

llvm/lib/Target/PowerPC/PPCBoolRetToInt.cpp

@@ -100,8 +100,8 @@ class PPCBoolRetToInt : public FunctionPass {
       Value *Zero = Constant::getNullValue(IntTy);
       PHINode *Q =
         PHINode::Create(IntTy, P->getNumIncomingValues(), P->getName(), P->getIterator());
-      for (unsigned i = 0; i < P->getNumOperands(); ++i)
-        Q->addIncoming(Zero, P->getIncomingBlock(i));
+      for (unsigned I = 0; I < P->getNumOperands(); ++I)
+        Q->addIncoming(Zero, P->getIncomingBlock(I));
       return Q;
     }
 
@@ -254,8 +254,8 @@ class PPCBoolRetToInt : public FunctionPass {
       // Operands of CallInst/Constant are skipped because they may not be Bool
       // type. For CallInst, their positions are defined by ABI.
       if (First && !isa<CallInst>(First) && !isa<Constant>(First))
-        for (unsigned i = 0; i < First->getNumOperands(); ++i)
-          Second->setOperand(i, BoolToIntMap[First->getOperand(i)]);
+        for (unsigned I = 0; I < First->getNumOperands(); ++I)
+          Second->setOperand(I, BoolToIntMap[First->getOperand(I)]);
     }
 
     Value *IntRetVal = BoolToIntMap[U];