Bug 1404547 - Enable 'enum' UBSan check. r=froydnj

Differential Revision: https://phabricator.services.mozilla.com/D65213

--HG--
extra : moz-landing-system : lando

build/moz.configure/toolchain.configure

@@ -1522,6 +1522,7 @@ def ubsan(options):
     default_checks = [
         'bool',
         'bounds',
+        'enum',
         'integer-divide-by-zero',
         'object-size',
         'pointer-overflow',

build/sanitizers/ubsan_enum_blacklist.txt

@@ -0,0 +1,17 @@
+# All entries in this file are to suppress issues reported by enum.
+# Blacklists for other reasons should go in separate blacklist files.
+
+[enum]
+
+# bug 1404151
+src:*/lul/LulDwarfExt.h
+src:*/lul/LulDwarf.cpp
+
+# bug 1405142
+src:*/widget/gtk/*
+
+# bug 1619468
+src:*/security/manager/ssl/nsSiteSecurityService.cpp
+
+# bug 1619484
+src:*/media/webrtc/trunk/webrtc/modules/desktop_capture/desktop_and_cursor_composer.cc