U8String / U8String / 7469318031

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perf: significant improvement to inline conversion of chars and Runes
- most spills are now elided
- conversions on constants are folded into a single pre-computed store of bytes packed into an integer
- when conversions are not folded, the methods are now less likely to be inlined (not profitable) and conversion codegen is more compact
- split iterator loops now have codegen quality which is not far from Rust
- this is paid for by increased code duplication and complexity so unfortunately not "free" overall

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