As you can see here https://launchpadlibrarian.net/251967168/buildlog_ubuntu-xenial-amd64.mongodb_1%3A3.3.3-0ubuntu1_BUILDING.txt.gz a build with --use-system-tcmalloc failed because tcmalloc_server_status_section.cpp could not find valgrind.h. This is a logic failure in src/mongo/utils/SConscript: it only calls tcmspEnv.InjectThirdPartyIncludePaths('valgrind') if using the third party tcmalloc, not if using the third parth valgrind.
I'll send a PR with a fix in a moment.
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