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The fork server replaces the process's `argv` and `environ` with heap-allocated strings received over IPC; if those strings are later unlinked from those vectors, they will be seen as leaked. Also, we have an implementation of `setproctitle` (a BSD feature that has to be emulated somewhat hackily on Linux) which copies the process's original `argv` and `environ` strings into the heap so the original space can be reused; this can also cause (finite) leaks when those strings are later discarded. Given that we already tell Valgrind to ignore leaks caused by use of `setenv` and similar, this patch likewise suppresses those leaks. Differential Revision: https://phabricator.services.mozilla.com/D201190