fix(math): correct Math.asinh for large finite inputs

[HiteshShonak]

This Pull Request fixes/closes #5239.

It changes the following:

• When the absolute value of the input is finite and greater than 1/√f64::EPSILON (67_108_864.0), fall back to n.signum() * (n.abs().ln() + LN_2) instead of calling f64::asinh() directly, avoiding an internal overflow that produces Infinity. threshold follows the Boost math library convention.
• Add regression tests for Math.asinh(1e308), Math.asinh(-1e308), and Math.asinh(Number.MAX_VALUE).

Testing:

cargo test -p boa_engine math -- --nocapture

Spec reference: https://tc39.es/ecma262/#sec-math.asinh

[Copilot]

Pull request overview

Fixes Math.asinh returning Infinity for very large finite inputs by introducing a large-input fallback formula consistent with common libm/Boost behavior, and adds regression tests to prevent recurrence.

Changes:

• Add a large-input threshold in Math.asinh to compute sign(x) * (ln(|x|) + LN_2) for large finite x, avoiding overflow in f64::asinh().
• Add regression tests for Math.asinh(1e308), Math.asinh(-1e308), and Math.asinh(Number.MAX_VALUE).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
core/engine/src/builtins/math/mod.rs	Adds a large-input branch to keep Math.asinh finite for extremely large finite numbers.
core/engine/src/builtins/math/tests.rs	Adds regression coverage for large finite inputs that previously overflowed to infinities.

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[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	52,963	52,963	0
Passed	50,732	50,732	0
Ignored	1,426	1,426	0
Failed	805	805	0
Panics	0	0	0
Conformance	95.79%	95.79%	0.00%

Tested main commit: 8fcbfcbb8b9e70fe878d28376a6496eaa57a70d7
Tested PR commit: 02c601e54d40286ff20435c72909ec440d2a0974
Compare commits: 8fcbfcb...02c601e

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.83%. Comparing base (6ddc2b4) to head (94fb037).
⚠️ Report is 917 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #5240       +/-   ##
===========================================
+ Coverage   47.24%   59.83%   +12.58%     
===========================================
  Files         476      582      +106     
  Lines       46892    63459    +16567     
===========================================
+ Hits        22154    37968    +15814     
- Misses      24738    25491      +753     

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