QCache: Fix the usage of std::is_nothrow_assignable_v

The std::is_nothrow_assignable_v template takes two template
parameters. Current clang nightly errors out on the previous code,
while earlier versions, and GCC, fail to diagnose the missing
template parameter.

Change-Id: I8ae7d5b9a9e89c5579e5526fb29d4da5cd1ab859
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

src/corelib/tools/qcache.h

@@ -111,7 +111,7 @@ class QCache
         {
             return Node(k, std::move(t));
         }
-        void replace(const Value &t) noexcept(std::is_nothrow_assignable_v<T>)
+        void replace(const Value &t) noexcept(std::is_nothrow_assignable_v<T, T>)
         {
             value = t;
         }