[libc++][test] Fix more MSVC warnings

libcxx/test/std/input.output/string.streams/stringbuf/stringbuf.assign/member_swap_noexcept.pass.cpp

@@ -27,7 +27,7 @@ struct test_alloc {
   using value_type = T;
 
   [[nodiscard]] constexpr T* allocate(std::size_t) { return nullptr; }
-  void deallocate(void*, unsigned) {}
+  void deallocate(void*, std::size_t) {}
 };
 
 template <class T>

libcxx/test/std/input.output/string.streams/stringbuf/stringbuf.assign/nonmember_swap_noexcept.pass.cpp

@@ -26,7 +26,7 @@ struct test_alloc {
   using value_type = T;
 
   [[nodiscard]] constexpr T* allocate(std::size_t) { return nullptr; }
-  void deallocate(void*, unsigned) {}
+  void deallocate(void*, std::size_t) {}
 };
 
 template <class T>

libcxx/test/std/ranges/range.adaptors/range.filter/iterator/arrow.pass.cpp

@@ -59,7 +59,7 @@ struct WithNonCopyableIterator : std::ranges::view_base {
     iterator(iterator&&);
     iterator& operator=(iterator&&);
     XYPoint& operator*() const;
-    iterator operator->() const;
+    XYPoint* operator->() const;
     iterator& operator++();
     iterator operator++(int);
 

libcxx/test/std/ranges/range.factories/range.repeat.view/size.pass.cpp

@@ -31,8 +31,9 @@ constexpr bool test() {
   }
 
   {
-    std::ranges::repeat_view<int, int> rv(10, std::numeric_limits<int>::max());
-    assert(rv.size() == std::numeric_limits<int>::max());
+    constexpr int int_max = std::numeric_limits<int>::max();
+    std::ranges::repeat_view<int, int> rv(10, int_max);
+    assert(rv.size() == int_max);
   }
 
   return true;