[libcxx] [test] Fix a non-Standard allocator in vector.cons/construct_iter_iter_alloc.pass.cpp.

[STL_MSFT]

Summary

Fix a non-Standard allocator in vector.cons/construct_iter_iter_alloc.pass.cpp.

You gotta have a rebinding constructor. MSVC loves rebinding.

[EricWF]

r276588.

test/std/containers/sequences/vector/vector.cons/construct_iter_iter_alloc.pass.cpp

 
 #if TEST_STD_VER >= 11
 
 template <class T>
 struct implicit_conv_allocator : min_allocator<T>
 {
     implicit_conv_allocator(void*) {}
     implicit_conv_allocator(const implicit_conv_allocator&) = default;
+
+    template <class U>
+    implicit_conv_allocator(implicit_conv_allocator<U>) {}
 };
 
 #endif
 
 int main()
 {
     {
     int a[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 8, 7, 6, 5, 4, 3, 1, 0};