[compiler] PruneNonEscapingScopes understands terminal operands

We weren't treating terminal operands as eligible for memoization in PruneNonEscapingScopes, which meant that they could end up un-memoized. Terminal operands can also be compound ReactiveValues like SequenceExpressions, so part of the fix is to make sure we don't just recurse into compound values but record the full aliasing information we would for top-level instructions.

Still WIP, this needs to handle terminals other than for..of.

ghstack-source-id: 09a29230514e3bc95d1833cd4392de238fabbeda
Pull Request resolved: https://github.com/facebook/react/pull/33062