fix(es/minifier): preserve argument aliases in nested scopes

[cyphercodes]

Description:

Assignments to a function parameter can occur inside a nested closure. The unused-assignment optimizer was checking arguments usage in that nested scope, which allowed it to remove the assignment even when the parameter is aliased by the outer non-strict function's arguments object.

This changes the lookup to use the parameter's declaring syntax context and adds a regression fixture for the nested-assignment case.

Verification:

• cargo test -p swc_ecma_minifier --test compress 12032 -- --nocapture
• cargo test -p swc_ecma_minifier (2,128 passed, 1 ignored)
• cargo clippy -p swc_ecma_minifier --all-targets -- -D warnings
• cargo fmt --all -- --check
• Node execution of both fixture input and optimized output (2 in both cases)

Fixes #12032

BREAKING CHANGE:

None.

Related issue (if exists):

#12032

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Latest commit: 0a1971a

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[Austaras]

This would not be enough. In inline pass swc would change ident ctxt(to avoid name collision) which would result in non exist scope data.

[codspeed-hq]

Merging this PR will not alter performance

✅ 189 untouched benchmarks
⏩ 61 skipped benchmarks¹

---

_{Comparing cyphercodes:fix-12032-preserve-arguments-alias (0a1971a) with main (d1a1e23)²}

Footnotes

1. 61 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

2. No successful run was found on main (1b17f34) during the generation of this report, so d1a1e23 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩