[PATCH] Test case for BZ 19329

[Szabolcs Nagy]

Test concurrent dlopen and pthread_create when the loaded
modules have TLS.  This triggers dl-tls assertion failures
more reliably than the tst-stack4 test.

The dlopened module has 100 DT_NEEDED dependencies and
for me about 4000 concurrent thread creations are needed
to see failures on x86_64.

2016-11-24  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	[BZ #19329]
	* nptl/Makefile (tests): Add tst-tls7.
	(modules-names): Add tst-tls7mod, tst-tls7mod-dep.
	* nptl/tst-tls7.c: New file.
	* nptl/tst-tls7mod-dep.c: New file.
	* nptl/tst-tls7mod.c: New file.
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