Move and share shell TextEncoder/TextDecoder polyfill

[danleh]

Just to reduce some redundancy, and might also be useful for #170 (where another TextDecoder polyfill was about to be added.)

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[camillobruni]

Ok, a bit nit-picky: instead of polyfills/fast-text-encoding-1.0.3/text.js could we use polyfills/fast-text-encoding/1.0.3/text.js and put all package meta information in polyfills/fast-text-encoding?

[danleh]

I'm not sure why jsc/Safari are failing on CI, it does not locally on my x64 Linux machine.

The log at https://github.com/WebKit/JetStream/actions/runs/17401099724/job/49401838880?pr=173#step:8:39 seems to already have an error when jsvu installs and smoke-tests jsc

Testing…
  ✖ Error: Command failed with exit code 133 (Unknown system error -133): /Users/runner/.jsvu/bin/javascriptcore /private/var/folders/x7/ch5v91h56_zbvbd1y2f600dm0000gn/T/b478ccbb75b5498d84ea113a99050011

@kmiller68 can you reproduce or would know what this could be?

Edit: Since #172 CI fails with jsc with the same error (https://github.com/WebKit/JetStream/actions/runs/17403780714/job/49402823507?pr=172), and that doesn't even change any code that is run during testing, this looks like an error on JSC side.

[danleh]

JSC seems to be fine again, and Safari CI is failing since multiple weeks, so merging.