Eliminate bounds check for CharacterDataLatin1

[wenshao]

The length of the CharacterDataLatin1::A and CharacterDataLatin1::B arrays is 256. The code that accesses the arrays in the getProperties and getPropertiesEx methods can use & 0xff to eliminate bounds checks.

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[ExE-Boss]

ch & 0xFF can also be used in CharacterDataLatin1​::digits​(int, int).