<algorithm> no longer needs to include <cstdlib>, but can get away with just...

<algorithm> no longer needs to include <cstdlib>, but can get away with just <cstddef>.  This was brought to my attention by Salvatore Benedetto in his port to a bare-metal coretex-m3.  This exposed two test bugs where an explicit #include <cstdlib> was needed.

llvm-svn: 160786