LWG4450 std::atomic_ref<T>::store_key should be disabled for const T

Fixes NB US 193-311 (C++26 CD).

Author: burblebee

source/threads.tex

@@ -3774,6 +3774,10 @@
 \end{itemdecl}
 
 \begin{itemdescr}
+\pnum
+\constraints
+\tcode{is_const_v<\placeholder{integral-type}>} is \tcode{false}.
+
 \pnum
 \expects
 \tcode{order} is \tcode{memory_order::relaxed},
@@ -4028,6 +4032,10 @@
 \end{itemdecl}
 
 \begin{itemdescr}
+\pnum
+\constraints
+\tcode{is_const_v<\placeholder{floating-point-type}>} is \tcode{false}.
+
 \pnum
 \expects
 \tcode{order} is \tcode{memory_order::relaxed},
@@ -4263,6 +4271,10 @@
 \end{itemdecl}
 
 \begin{itemdescr}
+\pnum
+\constraints
+\tcode{is_const_v<\placeholder{pointer-type}>} is \tcode{false}.
+
 \pnum
 \mandates
 \tcode{remove_pointer_t<\placeholder{pointer-type}>} is a complete object type.