Guard libc++ specific c.__invariants() tests in LIBCPP_ASSERT macros

llvm-svn: 267947
diff --git a/libcxx/test/std/strings/basic.string/string.cons/copy.pass.cpp b/libcxx/test/std/strings/basic.string/string.cons/copy.pass.cpp
index 9c9fc32..cc4deb9 100644
--- a/libcxx/test/std/strings/basic.string/string.cons/copy.pass.cpp
+++ b/libcxx/test/std/strings/basic.string/string.cons/copy.pass.cpp
@@ -14,6 +14,7 @@
 #include <string>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_allocator.h"
 #include "min_allocator.h"
 
@@ -22,7 +23,7 @@
 test(S s1)
 {
     S s2 = s1;
-    assert(s2.__invariants());
+    LIBCPP_ASSERT(s2.__invariants());
     assert(s2 == s1);
     assert(s2.capacity() >= s2.size());
     assert(s2.get_allocator() == s1.get_allocator());
@@ -37,7 +38,7 @@
     test(S("1", A(5)));
     test(S("1234567890123456789012345678901234567890123456789012345678901234567890", A(7)));
     }
-#if __cplusplus >= 201103L
+#if TEST_STD_VER >= 11
     {
     typedef min_allocator<char> A;
     typedef std::basic_string<char, std::char_traits<char>, A> S;