[PATCH, C] PR18249

[Shujing Zhao]

Hi,

This patch is to try to fix the c++ parser i18n problems. The parameter of 
cp_parser_error is change from "message" to "gmsgid".
At cp_parser_require, it uses the argument of "type" to classify the 
"token_desc". If "type" is CPP_KEYWORD, it uses strcmp to branch the messages. 
If "token_desc" includes " or ", such as "%<:%> or %<::%>", it would translate 
"expected " and "%<:%> or %<::%>" respectively.
cp_parser_require_keyword is changes to keep consistently with  cp_parser_require.
To fix the problem at cp_parser_name_lookup_error, a translated 'desired' would 
be passed to error_at.
An enum type non_integral_constant is defined to solve the problem of
at cp_parser_non_integral_constant_expression.

For the problem of 18248, the entire message still can't appear in gcc.pot. This 
patch is only to fix the c++ end.

Is it ok?

Thanks
Pearly
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