Remove Stack (part 4: remove Stack-only branches and types) #10798
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Last part extracted from #10517.
The first two commits remove unnecessary injections.
The last one is somewhat extensive and removes dead files and all branching on
typeof x.tag === 'number'
. It also removes precaching logic from the component tree (Stack only).validateDOMNesting
takes one less argument because Fiber always passednull
instead ofchildInstance
.For tests, it fixes up
ResponderEventPlugin-test.js
since it depended on Stack internal names.