[Bug c++/100805] __int128 should be disabled for non-extended -std= options

[schwab--- via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100805

--- Comment #1 from Andreas Schwab <sch...@linux-m68k.org> ---
The C++ standard says: [lex.icon] "If an integer literal cannot be represented
by any type in its list and an extended integer type (6.8.1) can represent its
value, it may have that extended integer type."