Joseph Myers ac782f9e9a Fix elf/loadtest.c build with GCC 8.
Building the testsuite with current GCC mainline fails with:

loadtest.c: In function 'main':
loadtest.c:76:3: error: macro expands to multiple statements [-Werror=multistatement-macros]
   for (map = MAPS; map != NULL; map = map->l_next)        \
   ^
loadtest.c:165:2: note: in expansion of macro 'OUT'
  OUT;
  ^~~
loadtest.c:164:7: note: some parts of macro expansion are not guarded by this 'if' clause
       if (debug)
       ^~

This seems like a genuine bug, although fairly harmless; it means the
fflush call in the OUT macro is unconditional instead of being inside
the conditional as presumably intended.  This patch makes this macro
use do { } while (0) to avoid the problem.

Tested for x86_64 (testsuite), and with build-many-glibcs.py for
aarch64-linux-gnu with GCC mainline.

	* elf/loadtest.c (OUT): Define using do { } while (0).
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