[committed] nptl: Add first-line description for barrier tests.

[Torvald Riegel]

Committed as obvious (once one is reminded that this is a style
requirement for new files).  Adapted older barrier tests as well.

2016-01-15  Torvald Riegel  <triegel@redhat.com>

        * nptl/tst-barrier1.c: Add description on first line.
        * nptl/tst-barrier2.c: Likewise.
        * nptl/tst-barrier3.c: Likewise.
        * nptl/tst-barrier4.c: Likewise.
        * nptl/tst-barrier5.c: Likewise.

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