Fix TextEncoderStream surrogate pair handling across chunks#5680
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Fix TextEncoderStream surrogate pair handling across chunks#5680
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jasnell
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LGTM, FWIW since it now has my code in it too :-)
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Fixes #5387
The WPT tests failed because we didn't handle utf-16 surrogate pairs correctly as the spec requires us, across separate chunks. Added a pending state to buffer a trailing high surrogate until the next chunk arrives, then either we pair it with a matching low surrogate or emit replacement character. Tried to use as much as simdutf code possible to make the code more readable and maintainable for people who are not experts in such areas.
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