test(hermes-base): real-compiler negative for the folded switch offset

[sunnylqm]

在真实编译器上补一个（UInt）SwitchImm 跳转表偏移折叠的负例（docs/hermes-base-verification.md §5 要求归一化规则带真实负例）。

背景：失败日报「未带指纹」桶里的 17 条被拒记录经逐条核对全部是表示层差异——11 条是 v2.26.1 以前没折叠经典 SwitchImm 的偏移（#84 已修），6 条是 v98 DefineOwnById 截断（#85 已修）。后者已有真实负例，前者只有正例。

测试：用外来 base 编一个 32 路稠密 switch，断言 delta 与 plain 的偏移确实不同且判等价；再在 delta 的 HBC 里交换 case 0/5 的跳转目标，断言判 different。本地 v96（RN 0.77）与 v98（hermes-compiler）均通过。

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Summary by CodeRabbit

• Tests
  • Added coverage confirming that comparisons identify differences in switch jump targets, including cases where the instruction bytes remain unchanged.
  • Verified that equivalent builds using different switch-table offsets are still recognized as equivalent before target offsets are changed.

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• tests/hermes-raw.test.ts

📝 Walkthrough

Walkthrough

Adds a test that checks equivalent switch builds with different folded offsets and detects swapped jump-table targets.

Changes

Switch comparison

Layer / File(s)	Summary
Test folded switch offset comparison tests/hermes-raw.test.ts	The test builds a plain switch and a foreign-base variant with 32 cases. It checks that the builds compare as equivalent, then swaps two jump-table targets and checks for a different result with a raw instruction detail.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Other

Merge Risk: 🔵 Low · up to bc9a0

The new test may pass without confirming that swapped jump-table targets are detected by the raw-bytecode audit. Add the detail assertion before merging, or accept this bounded test-coverage gap.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the main change: a real-compiler negative test for the folded switch offset in hermes-base.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1…
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Actionable comments posted: 1

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Inline comments:
In `@tests/hermes-raw.test.ts`:
- Line 280: Update the test using compareHermesBytecode to assert that
result.detail identifies a raw instruction difference, so the status assertion
cannot pass solely because disassembly differs.

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