dillon1000/react

Put common aliases in Map/Set instead of switch over strings (#26551)

This is a follow up to https://github.com/facebook/react/pull/26546

This is strictly a perf optimization since we know that switches over
strings aren't optimally implemented in current engines. Basically
they're a sequence of ifs.

As a result, we're better off putting the unusual cases in a Map and the
very common cases in the beginning of the switch. We might be better off
putting very common cases in explicit ifs - just in case the engine does
optimize switches to a hash table which is potentially worse.

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Co-authored-by: Sophie Alpert <[email protected]>