Peter Zhu f7bd9f0750 Fix unsigned int overflow in error message for chr
The error message has an integer overflow because it treats an unsigned int as a signed int.

Before:
```
> 3_000_000_000.chr
-1294967296 out of char range (RangeError)
```

After:
```
> 3_000_000_000.chr
3000000000 out of char range (RangeError)
```

Redmine ticket: https://bugs.ruby-lang.org/issues/17186
2020-09-30 00:31:59 +09:00
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