malloc-gnu-tests, etc.: use volatile for clang

In some more test locations, store the result of malloc etc. into
a volatile pointer so that clang doesn’t optimize away the malloc
and thus bypass the test.  This fixes a malloc-gnu test failure on
macOS 11.2.3 with clang 12.0.0 on ARM.
* tests/test-alloca-opt.c (do_allocation):
* tests/test-malloc-gnu.c (main):
* tests/test-malloca.c (do_allocation):
* tests/test-realloc-gnu.c (main):
* tests/test-reallocarray.c (main):
* tests/test-aligned-malloc.c (main):
* tests/test-aligned_alloc.c (main):
Store malloc etc. results into a volatile pointer.

0 files changed, 0 insertions, 0 deletions