[PATCH v5 1/5] libcpp: reject codepoints above 0x10FFFF

[Jason Merrill]

On 1/25/23 13:06, Ben Boeckel wrote:
> Unicode does not support such values because they are unrepresentable in
> UTF-16.
> 
> libcpp/
> 
> 	* charset.cc: Reject encodings of codepoints above 0x10FFFF.
> 	UTF-16 does not support such codepoints and therefore all
> 	Unicode rejects such values.

It seems that this causes a bunch of testsuite failures from tests that 
expect this limit to be checked elsewhere with a different diagnostic, 
so I think the easiest thing is to fold this into _cpp_valid_utf8_str 
instead, i.e.:

Make sense?

Jason
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