The 3rd test in shrink_to_fit.pass.cpp can't possibly pass if exceptions are disabled, so #ifdef'ing out the test.

llvm-svn: 178350
diff --git a/libcxx/test/containers/sequences/vector/vector.capacity/shrink_to_fit.pass.cpp b/libcxx/test/containers/sequences/vector/vector.capacity/shrink_to_fit.pass.cpp
index c98d531..896026d 100644
--- a/libcxx/test/containers/sequences/vector/vector.capacity/shrink_to_fit.pass.cpp
+++ b/libcxx/test/containers/sequences/vector/vector.capacity/shrink_to_fit.pass.cpp
@@ -31,6 +31,7 @@
         assert(v.capacity() == 101);
         assert(v.size() == 101);
     }
+#ifndef _LIBCPP_NO_EXCEPTIONS
     {
         std::vector<int, stack_allocator<int, 400> > v(100);
         v.push_back(1);
@@ -38,4 +39,5 @@
         assert(v.capacity() == 200);
         assert(v.size() == 101);
     }
+#endif
 }