Use assign in constructor

Author: kuhar

llvm/include/llvm/ADT/SmallVector.h

@@ -1220,23 +1220,23 @@ class LLVM_GSL_OWNER SmallVector : public SmallVectorImpl<T>,
 
   template <typename ItTy, typename = EnableIfConvertibleToInputIterator<ItTy>>
   SmallVector(ItTy S, ItTy E) : SmallVectorImpl<T>(N) {
-    this->append(S, E);
+    this->assign(S, E);
   }
 
   template <typename RangeTy>
   explicit SmallVector(const iterator_range<RangeTy> &R)
       : SmallVectorImpl<T>(N) {
-    this->append(R.begin(), R.end());
+    this->assign(R.begin(), R.end());
   }
 
   SmallVector(std::initializer_list<T> IL) : SmallVectorImpl<T>(N) {
-    this->append(IL);
+    this->assign(IL);
   }
 
   template <typename U,
             typename = std::enable_if_t<std::is_convertible_v<U, T>>>
   explicit SmallVector(ArrayRef<U> A) : SmallVectorImpl<T>(N) {
-    this->append(A.begin(), A.end());
+    this->assign(A);
   }
 
   SmallVector(const SmallVector &RHS) : SmallVectorImpl<T>(N) {