Temporarily disable the LCM/GCD tests under UBSAN.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@294417 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/numerics/numeric.ops/numeric.ops.gcd/gcd.pass.cpp

@@ -8,6 +8,8 @@
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: c++98, c++03, c++11, c++14
+// XFAIL: ubsan
+
 // <numeric>
 
 // template<class _M, class _N>

test/std/numerics/numeric.ops/numeric.ops.lcm/lcm.pass.cpp

@@ -8,6 +8,7 @@
 //===----------------------------------------------------------------------===//
 //
 // UNSUPPORTED: c++98, c++03, c++11, c++14
+// XFAIL: ubsan
 // <numeric>
 
 // template<class _M, class _N>