[gcc r15-9636] libstdc++: Add missing export for std::is_layout_compatible_v [PR120159]

[Jonathan Wakely]

https://gcc.gnu.org/g:d0e6d797b35ae89044f967160d4abe3868190f0f

commit r15-9636-gd0e6d797b35ae89044f967160d4abe3868190f0f
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Wed May 7 17:06:11 2025 +0100

    libstdc++: Add missing export for std::is_layout_compatible_v [PR120159]
    
    libstdc++-v3/ChangeLog:
    
            PR libstdc++/120159
            * src/c++23/std.cc.in (is_layout_compatible_v): Export.
    
    (cherry picked from commit 8a1f3615c01cdbf5b2d37448c8bb09a96d5e3330)

Diff:
---
 libstdc++-v3/src/c++23/std.cc.in | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libstdc++-v3/src/c++23/std.cc.in b/libstdc++-v3/src/c++23/std.cc.in
index 930a489ff44b..de34e649bba9 100644
--- a/libstdc++-v3/src/c++23/std.cc.in
+++ b/libstdc++-v3/src/c++23/std.cc.in
@@ -3107,6 +3107,7 @@ export namespace std
 #if __cpp_lib_is_layout_compatible
   using std::is_corresponding_member;
   using std::is_layout_compatible;
+  using std::is_layout_compatible_v;
 #endif
 #if __cpp_lib_is_pointer_interconvertible
   using std::is_pointer_interconvertible_base_of;