Timothy Flynn b85b8ca350 LibJS: Reduce UTF-8 to UTF-16 transcoding when only UTF-16 is wanted ...

When appending two strings together to form a new string, if both of the
strings are already UTF-16, create the new string as UTF-16 as well.

This shaves about 0.5 seconds off the following test262 test:
  RegExp/property-escapes/generated/General_Category_-_Decimal_Number.js

2021-08-10 23:07:50 +02:00

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