Merge revisions 14337, 14596 from the BUF_REMOVAL branch to trunk.
Change callgrind's init_cmdbuf function to allocate a large enough
buffer for the command line.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14597 a5019735-40e9-0310-863c-91ae7b9d1cf9