Use APInt safe isOne() method on ConstantInt instead of getZExtValue()==1

llvm-svn: 34854
diff --git a/llvm/lib/Transforms/Utils/LowerAllocations.cpp b/llvm/lib/Transforms/Utils/LowerAllocations.cpp
index 0213daf..8acaeed 100644
--- a/llvm/lib/Transforms/Utils/LowerAllocations.cpp
+++ b/llvm/lib/Transforms/Utils/LowerAllocations.cpp
@@ -121,7 +121,7 @@
 
       if (MI->isArrayAllocation()) {
         if (isa<ConstantInt>(MallocArg) &&
-            cast<ConstantInt>(MallocArg)->getZExtValue() == 1) {
+            cast<ConstantInt>(MallocArg)->isOne()) {
           MallocArg = MI->getOperand(0);         // Operand * 1 = Operand
         } else if (Constant *CO = dyn_cast<Constant>(MI->getOperand(0))) {
           CO = ConstantExpr::getIntegerCast(CO, IntPtrTy, false /*ZExt*/);