Fix a typo 'iff' => 'if'

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164767 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/InstCombine/InstCombineAddSub.cpp b/lib/Transforms/InstCombine/InstCombineAddSub.cpp
index 99b62f8..874bb8f 100644
--- a/lib/Transforms/InstCombine/InstCombineAddSub.cpp
+++ b/lib/Transforms/InstCombine/InstCombineAddSub.cpp
@@ -200,7 +200,7 @@
   if (dyn_castFoldableMul(RHS, C2) == LHS)
     return BinaryOperator::CreateMul(LHS, AddOne(C2));
 
-  // A+B --> A|B iff A and B have no bits set in common.
+  // A+B --> A|B if A and B have no bits set in common.
   if (IntegerType *IT = dyn_cast<IntegerType>(I.getType())) {
     APInt LHSKnownOne(IT->getBitWidth(), 0);
     APInt LHSKnownZero(IT->getBitWidth(), 0);
@@ -216,7 +216,7 @@
     }
   }
 
-  // W*X + Y*Z --> W * (X+Z)  iff W == Y
+  // W*X + Y*Z --> W * (X+Z)  if W == Y
   {
     Value *W, *X, *Y, *Z;
     if (match(LHS, m_Mul(m_Value(W), m_Value(X))) &&