TBBs with UBSan create lots of errors when running
When running TBBs (based on ESR 24) built with UBSan we get loads of errors which look like:
/home/ubuntu/build/tor-browser/js/src/jsobj.cpp:1008:17: runtime error: load of value 120, which is not a valid value for type 'bool'
pkix_pl_object.c:580:31: runtime error: left shift of 4276994303 by 32 places cannot be represented in type 'long int'
/home/ubuntu/build/tor-browser/db/sqlite3/src/sqlite3.c:62742:22: runtime error: left shift of 173 by 24 places cannot be represented in type 'int'
/home/ubuntu/build/tor-browser/layout/style/nsCSSParser.cpp:4861:53: runtime error: load of value 128, which is not a valid value for type 'bool'
/home/ubuntu/build/tor-browser/layout/style/../base/nsStyleConsts.h:27:12: runtime error: load of value 4, which is not a valid value for type 'Side'
/home/ubuntu/build/tor-browser/layout/style/nsCSSParser.cpp:6181:3: runtime error: load of value 4, which is not a valid value for type 'Side'
/home/ubuntu/build/tor-browser/layout/style/nsCSSParser.cpp:7962:5: runtime error: load of value 4, which is not a valid value for type 'Side'
/home/ubuntu/build/tor-browser/dom/workers/Workers.h:81:18: runtime error: load of value 4294967295, which is not a valid value for type 'JSGCParamKey'
/home/ubuntu/build/tor-browser/dom/workers/Workers.h:135:23: runtime error: load of value 4294967295, which is not a valid value for type 'JSGCParamKey'
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