Andreas Kling
dbf52a1b5f
LibJS: Allocate RegExp.{lastMatch,leftContext,rightContext} lazily
...
These properties are always substrings of the RegExp input string,
and so we can store them as views and lazily construct strings if
they're actually accessed (which most of the time they aren't).
This avoids a bunch of unnecessary memory copying, saving roughly
2.1 seconds per iteration of Speedometer.
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