[committed] libstdc++: Restore call to test6642 in string_vector_iterators.cc test [PR104874]

[Tomasz Kamiński]

The test call was accidentally omitted in r16-2484-gdc49c0a46ec96e,
a commit that refactored this test file. This patch adds it back.

        PR libstdc++/104874

libstdc++-v3/ChangeLog:

        * testsuite/24_iterators/random_access/string_vector_iterators.cc:
        Call test6642.
---
Pushed to trunk.
 .../24_iterators/random_access/string_vector_iterators.cc        | 1 +
 1 file changed, 1 insertion(+)

diff --git 
a/libstdc++-v3/testsuite/24_iterators/random_access/string_vector_iterators.cc 
b/libstdc++-v3/testsuite/24_iterators/random_access/string_vector_iterators.cc
index 22803e7ece7..d6b95d68ddd 100644
--- 
a/libstdc++-v3/testsuite/24_iterators/random_access/string_vector_iterators.cc
+++ 
b/libstdc++-v3/testsuite/24_iterators/random_access/string_vector_iterators.cc
@@ -370,5 +370,6 @@ main()
    string_stuff();
    vector_stuff();
    reverse_stuff();
+   test6642();
    return 0;
 }
-- 
2.50.1