fix(llvm): resolve duplicate data-layout specifications last-wins

[julia-script]

Summary

• replace duplicate integer, float, vector, and pointer data-layout rules by semantic key so the final textual occurrence is authoritative
• keep the public semantic collections immutable and deterministically key-sorted while preserving the original byte-exact layout spelling
• add pinned LLVM 22.1.8 coverage for both source orders, p versus p0, nonzero address spaces, singleton precedence, and cumulative n / ni fields
• preserve the aggregate-alignment behavior merged in fix(llvm): honor aggregate alignment specifications #291 while rebasing onto current main

Verification

• pnpm typecheck
• pnpm exec biome check .
• pnpm test
• pnpm check
• pnpm release:candidate

Linear: JUL-27

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