Add temporary printouts to test to help debug failures.

Some debian libc++ bots started having failures in the locale
tests due to what I assume is a change in the locale data for fr_FR
in glibc.

This change prints the actual value from the test to help debugging.
It should be reverted once the bots cycle.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@328268 91177308-0d34-0410-b5e6-96231b3b80d8