[Bug preprocessor/82359] #line does not allow C++14 quotes in number

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82359

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Andrew Schepler from comment #0)
> In C++14 and later, any integer literal may contain single quote characters
> (aka apostrophe, ASCII 0x27).

That's a standard defect (and has already been raised as such on the committee
reflector).