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Folks,
I want to reopen an old discussion on ltp_clone and stack alignment
issue (see
http://sourceforge.net/mailarchive/message.php?msg_name=4B421480.1040400%40petalogix.com).
Indeed recently a commit has partially fixed a problem on ARM
(0056e395170eb8fc3ffbb22d7bd364fe47c2013e), but I think this should be
extended to all archs that have stack that grows downwards.

Indeed, as Jiri replied in that old thread, the value passed to clone as
child stack should be never accessed,  because it is the topmost address
of the memory allocated for the child process (it's the previous stack
pointer).

So, in archs that do not like unaligned stack, using (stack - size - 1 )
will cause the process to be killed by a SIGBUS, on other archs, we are
just wasting one byte of the malloc-ed stack.

On my SH4 arch, the stack must be 4byte aligned (as in ARM).

Please, find attached a patch against master branch

Best regards,
Carmelo
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