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Forbid out of range Unicode code points.
Unicode allows code points up to 0x10FFFF, but Perl allows much more.
However, code points above IV_MAX may not always work correctly, and
may even cause the interpreter to hang. Code points exceeding IV_MAX
have been deprecated since 5.24, and will be illegal in 5.28.
This commit removes many tests (without replacing them) as they were
testing behaviour of code points exceeding IV_MAX.