Upgrading V8 means recompiling native android modules, We updated our core set in
TIMOB-19794 but as the community will need to do this too we should document how to do it.
From Chris' comment on that ticket it's basically the below, all of the below refer to properties in the manifest file. The user must be using NDK11 (NDK12 might work but I think NDK11 is what we're going with), and either set that in Studio or by using ti config android.ndkPath
Also there is a change documented in this commit https://github.com/appcelerator/titanium_mobile/pull/8306/commits/6580b5ee080cbd9cfd96f0dbdc6e31390c72a20d I think this isn't a new in 6 thing but seeing as the templates were only updated there might be a few modules still using the old code