Disabled random operators tests under UBSAN.

The tests use random input to various arithmetic and bitwise operators,
which cause undefined behavior, such as shifting by more than the left
operand capacity or signed integer overflows.

test/operators_test.cpp

@@ -28,7 +28,6 @@
 
 #include <iostream>  // for std::cout (std::endl indirectly)
 
-
 namespace
 {
     // avoiding a template version of true_value so as to not confuse VC++
@@ -615,6 +614,8 @@ main()
 
     cout << "Created point, and operated on it." << endl;
 
+#if !defined(UBSAN)
+    // Using random values produce UB in various tests, such as shifting by more than the left operand capacity or signed integer overflows
     for (int n = 0; n < 1000; ++n)  // was 10,000 but took too long (Beman)
     {
         boost::detail::minstd_rand r;
@@ -640,6 +641,7 @@ main()
     }
 
     cout << "Did random tester loop." << endl;
+#endif // !defined(UBSAN)
 
     MyInt i1(1);
     MyInt i2(2);