[libcxx] [test] Fix Clang -Wpessimizing-move "moving a temporary object prevents copy elision".

N4618 30.6.6 [futures.unique_future]/12 declares "shared_future<R> share() noexcept;".

Fixes D29139.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@294158 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/thread/futures/futures.unique_future/share.pass.cpp

@@ -26,7 +26,7 @@ int main()
         std::promise<T> p;
         std::future<T> f0 = p.get_future();
         static_assert( noexcept(f0.share()), "");
-        std::shared_future<T> f = std::move(f0.share());
+        std::shared_future<T> f = f0.share();
         assert(!f0.valid());
         assert(f.valid());
     }
@@ -34,7 +34,7 @@ int main()
         typedef int T;
         std::future<T> f0;
         static_assert( noexcept(f0.share()), "");
-        std::shared_future<T> f = std::move(f0.share());
+        std::shared_future<T> f = f0.share();
         assert(!f0.valid());
         assert(!f.valid());
     }
@@ -43,7 +43,7 @@ int main()
         std::promise<T> p;
         std::future<T> f0 = p.get_future();
         static_assert( noexcept(f0.share()), "");
-        std::shared_future<T> f = std::move(f0.share());
+        std::shared_future<T> f = f0.share();
         assert(!f0.valid());
         assert(f.valid());
     }
@@ -51,7 +51,7 @@ int main()
         typedef int& T;
         std::future<T> f0;
         static_assert( noexcept(f0.share()), "");
-        std::shared_future<T> f = std::move(f0.share());
+        std::shared_future<T> f = f0.share();
         assert(!f0.valid());
         assert(!f.valid());
     }
@@ -60,7 +60,7 @@ int main()
         std::promise<T> p;
         std::future<T> f0 = p.get_future();
         static_assert( noexcept(f0.share()), "");
-        std::shared_future<T> f = std::move(f0.share());
+        std::shared_future<T> f = f0.share();
         assert(!f0.valid());
         assert(f.valid());
     }
@@ -68,7 +68,7 @@ int main()
         typedef void T;
         std::future<T> f0;
         static_assert( noexcept(f0.share()), "");
-        std::shared_future<T> f = std::move(f0.share());
+        std::shared_future<T> f = f0.share();
         assert(!f0.valid());
         assert(!f.valid());
     }