Follow up to #33736.
If we need to save on CPU/memory pressure, we can instead just pray and
hope that a Promise doesn't get garbage collected before we need to read
it.
This can cause fragile access to the Promise value in devtools
especially if it's a slow and pressured render.
Basically, you'd have to hope that GC doesn't run after the inner await
finishes its microtask callback and before the resolution of the
component being rendered is invoked.
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