Add a command line option to allow the user to provide an upper bound
for the number of connected processes. This is still lame but better
than asking her to recompile.
Part of fixing BZ #337869.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14838 a5019735-40e9-0310-863c-91ae7b9d1cf9
Import offsetof and vg_alignof from VEX (tracking VEX r3049).


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14839 a5019735-40e9-0310-863c-91ae7b9d1cf9