dillon1000/react

[compiler] Option to always take the non-memo branch

Summary: This adds a debugging mode to the compiler that simply adds a `|| true` to the guard on all memoization blocks, which results in the generated code never using memoized values and always recomputing them. This is designed as a validation tool for the compiler's correctness--every program *should* behave exactly the same with this option enabled as it would with it disabled, and so any difference in behavior should be investigated as either a compiler bug or a pipeline issue.

(We add `|| true` rather than dropping the conditional block entirely because we still want to exercise the guard tests, in case the guards themselves are the source of an error, like reading a property from undefined in a guard.)

ghstack-source-id: 955a47ec1689842da82552225a19a1008c57fe2c
Pull Request resolved: https://github.com/facebook/react/pull/29655