Implement LWG2733: [fund.ts.v2] gcd / lcm and bool. We already did tbis for C++17, so replicate the changes in experimental.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@292962 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/experimental/numeric/numeric.ops/numeric.ops.gcd/gcd.bool2.fail.cpp

@@ -0,0 +1,25 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// UNSUPPORTED: c++98, c++03, c++11
+// <numeric>
+
+// template<class _M, class _N>
+// constexpr common_type_t<_M,_N> gcd(_M __m, _N __n)
+
+// Remarks: If either M or N is not an integer type,
+// or if either is (a possibly cv-qualified) bool, the program is ill-formed.
+
+#include <experimental/numeric>
+
+
+int main()
+{
+    std::experimental::gcd(2, true);
+}