test: migrate math/base/specia/exp to ULP-based testing

[Arjan-P]

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Resolves a part of #11352.

Description

What is the purpose of this pull request?

This pull request:

• Migrates math/base/special/exp tests (test.js, test.native.js) from relative testing to ULP difference based testing.

Related Issues

Does this pull request have any related issues?

This pull request has the following related issues:

• [RFC]: Migrate math/base/special packages from relative tolerance testing to ULP difference testing (tracking issue) #11352.

Questions

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No.

Other

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No.

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Coverage Report

Package	Statements	Branches	Functions	Lines
math/base/special/exp	$\\color{red}481/487$ $\\color{green}+0.00\\%$	$\\color{red}21/24$ $\\color{green}+0.00\\%$	$\\color{green}4/4$ $\\color{green}+0.00\\%$	$\\color{red}481/487$ $\\color{green}+0.00\\%$

The above coverage report was generated for the changes in this PR.

[kgryte]

@Arjan-P You've used 3 ULPs here, but the test previously only showed a single epsilon difference, so I am curious whether you confirmed that 3 ULPs is the minimum number you needed in order to get the tests to pass. That applies here and throughout this PR.

[Arjan-P]

@kgryte Thats actually my bad. Tests were failing initially for an unrelated reason for which I tried to increase the ULP. Just forgot to change it back.

[Arjan-P]

Would it be fine if I added a commit addressing this?

[kgryte]

Yes, just push another commit.

[kgryte]

Left an initial comment.