solidjs / solid / 42460360191

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perf(compiler): drop DOM walks to nodes nothing reads (#4714)

- Positional ids are handed out before the compiler knows whether a
  child's insert needs a marker. A text node ahead of an appended
  expression got `var _el$3 = _el$2.firstChild` that nothing read.
- Minifiers keep the read, since it could be a getter.
- Both compilers now drop a `firstChild` or `nextSibling` walk when no
  later statement reads its node.
- Client gzip on the repo's examples changes by 0 to -24 B. Hydrating
  builds do not change.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

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