[Gecko Bug 1517322] Allow LSAN suppressions path to be set from wptrunner command line #15044
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Previously we assumed that the path for the lsan_suppressions.txt file was the same as the prefs path,
which is correct in CI but wrong for local builds. This adds a --lsan-dir command line argument and sets
it in mach to the correct value for local builds and uses the prefs directory as a default for backwards
compatibility
Differential Revision: https://phabricator.services.mozilla.com/D16024
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1517322
gecko-commit: f65f0c93a581bad32c5afb454f19596f701083f5
gecko-integration-branch: central
gecko-reviewers: mccr8