remove default TTI arg

Author: inbelic

llvm/include/llvm/Analysis/VectorUtils.h

@@ -152,8 +152,8 @@ bool isVectorIntrinsicWithScalarOpAtArg(Intrinsic::ID ID,
 
 /// Identifies if the vector form of the intrinsic is overloaded on the type of
 /// the operand at index \p OpdIdx, or on the return type if \p OpdIdx is -1.
-bool isVectorIntrinsicWithOverloadTypeAtArg(
-    Intrinsic::ID ID, int OpdIdx, const TargetTransformInfo *TTI = nullptr);
+bool isVectorIntrinsicWithOverloadTypeAtArg(Intrinsic::ID ID, int OpdIdx,
+                                            const TargetTransformInfo *TTI);
 
 /// Identifies if the vector form of the intrinsic that returns a struct is
 /// overloaded at the struct element index \p RetIdx.