[libc++][vector] Inline remaining constructors filling vector with the same value

Author: mtezych

libcxx/include/vector

@@ -423,11 +423,36 @@ public:
 #endif
       : __end_cap_(nullptr, __a) {
   }
-  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI explicit vector(size_type __n);
+
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI explicit vector(size_type __n) {
+    auto __guard = std::__make_exception_guard(__destroy_vector(*this));
+    if (__n > 0) {
+      __vallocate(__n);
+      __construct_at_end(__n);
+    }
+    __guard.__complete();
+  }
+
 #if _LIBCPP_STD_VER >= 14
-  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI explicit vector(size_type __n, const allocator_type& __a);
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI explicit vector(size_type __n, const allocator_type& __a)
+      : __end_cap_(nullptr, __a) {
+    auto __guard = std::__make_exception_guard(__destroy_vector(*this));
+    if (__n > 0) {
+      __vallocate(__n);
+      __construct_at_end(__n);
+    }
+    __guard.__complete();
+  }
 #endif
-  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI vector(size_type __n, const value_type& __x);
+
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI vector(size_type __n, const value_type& __x) {
+    auto __guard = std::__make_exception_guard(__destroy_vector(*this));
+    if (__n > 0) {
+      __vallocate(__n);
+      __construct_at_end(__n, __x);
+    }
+    __guard.__complete();
+  }
 
   template <__enable_if_t<__is_allocator<_Allocator>::value, int> = 0>
   _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI
@@ -1132,39 +1157,6 @@ _LIBCPP_CONSTEXPR_SINCE_CXX20 void vector<_Tp, _Allocator>::__append(size_type _
   }
 }
 
-template <class _Tp, class _Allocator>
-_LIBCPP_CONSTEXPR_SINCE_CXX20 vector<_Tp, _Allocator>::vector(size_type __n) {
-  auto __guard = std::__make_exception_guard(__destroy_vector(*this));
-  if (__n > 0) {
-    __vallocate(__n);
-    __construct_at_end(__n);
-  }
-  __guard.__complete();
-}
-
-#if _LIBCPP_STD_VER >= 14
-template <class _Tp, class _Allocator>
-_LIBCPP_CONSTEXPR_SINCE_CXX20 vector<_Tp, _Allocator>::vector(size_type __n, const allocator_type& __a)
-    : __end_cap_(nullptr, __a) {
-  auto __guard = std::__make_exception_guard(__destroy_vector(*this));
-  if (__n > 0) {
-    __vallocate(__n);
-    __construct_at_end(__n);
-  }
-  __guard.__complete();
-}
-#endif
-
-template <class _Tp, class _Allocator>
-_LIBCPP_CONSTEXPR_SINCE_CXX20 vector<_Tp, _Allocator>::vector(size_type __n, const value_type& __x) {
-  auto __guard = std::__make_exception_guard(__destroy_vector(*this));
-  if (__n > 0) {
-    __vallocate(__n);
-    __construct_at_end(__n, __x);
-  }
-  __guard.__complete();
-}
-
 template <class _Tp, class _Allocator>
 template <class _InputIterator,
           __enable_if_t<__has_exactly_input_iterator_category<_InputIterator>::value &&