* elf/Makefile (distribute): Add tst-alignmod.c.
(tests): Add tst-align.
(modules-names): Add tst-alignmod.
(CFLAGS-tst-align.c, CFLAGS-tst-alignmod.c): Add
$(stack-align-test-flags).
($(objpfx)tst-align): Depend on libdl.
($(objpfx)tst-align.out): Depend on tst-alignmod.so.
* elf/tst-align.c: New file.
* elf/tst-alignmod.c: New file.
* misc/Makefile (CFLAGS-tst-tsearch.c): Add $(stack-align-test-flags).
* misc/tst-tsearch.c: Include tst-stack-align.h.
(stack_align_check): New array.
(cmp_fn, walk_action): Use TEST_STACK_ALIGN ().
(main): Report error if stack was not enough aligned
in cmp_fn or walk_action.
* stdlib/Makefile (CFLAGS-tst-qsort.c): Add $(stack-align-test-flags).
* stdlib/tst-qsort.c: Include tst-stack-align.h.
(align_check): New var.
(compare): Use TEST_STACK_ALIGN () macro.
(main): Report error if stack was not enough aligned in compare.
* sysdeps/i386/i686/Makefile (stack-align-test-flags): Remove
unneeded -mpreferred-stack-boundary=4.
* sysdeps/x86_64/tst-stack-align.h: New file.