Implement "chilled" Strings #8226
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In implementing the feature I took the least complicated route. We get a new Operand and in JIT we just add a second chilled boolean vs trying to shave this to a three-state value. One uncertainty is that I mark chilled as both frozen and chilled in RubyString flags. I did this because there are lots of isFrozen() checks in our codebase and I would like to fail fast if we find a path where chill should convert to mutable and we miss it. If we were certain we could probably only set chill flag and then check that in `frozen?`.
…rly mark mutable strings
…o not cache them like frozen
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In implementing the feature I took the least complicated route. We get a new Operand and in JIT we just add a second chilled boolean vs trying to shave this to a three-state value.
One uncertainty is that I mark chilled as both frozen and chilled in RubyString flags. I did this because there are lots of isFrozen() checks in our codebase and I would like to fail fast if we find a path where chill should convert to mutable and we miss it. If we were certain we could probably only set chill flag and then check that in
frozen?.