Andreas Kling 206479b2b5 LibJS: Cache UTF-16 strings on the VM ...

We were already caching UTF-8 and byte strings, so let's add a cache
for UTF-16 strings as well. This is particularly profitable whenever we
run regular expressions, since the output of regex execution is a set of
UTF-16 strings.

Note that this is a weak cache like the other JS string caches, meaning
that strings are removed from the cache as they are garbage collected.

This avoids billions of PrimitiveString allocations across a run of WPT,
significantly reducing GC activity.

2024-10-24 19:00:00 -04:00

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