[update] update to upstream commit 904d8b8
Squashed 'qtjsbackend/' changes from 7d469e8..ca1ac76

ca1ac76 [V8] Fix stack alignment corruption for MinGW32 build

git-subtree-dir: qtjsbackend
git-subtree-split: ca1ac7634f00b845ded92b5fabfa0d1c53197b01
Merge commit 'e48c175acf37d75e00a3078df4eb11d8c81b7cbb'