Bug 1919684 - disable browser_very_fission.js for linux/asan. r=smolnar DONTBUILD

Differential Revision: https://phabricator.services.mozilla.com/D222732

dom/ipc/tests/browser.toml

@@ -78,6 +78,7 @@ skip-if = ["true"]
 ["browser_very_fission.js"]
 support-files = ["file_dummy.html"]
 run-if = ["os == 'linux'"]
+skip-if = ["asan"] # appears to hang the machine
 
 ["browser_wpi_isolate_everything.js"]
 support-files = ["browser_wpi_base.js"]