long long, C++ testsuite and -ansi -pedantic-errors

[Richard Kenner]

    If it's not part of the current standard, and if there is a controversy,
    even amongst the committee members, about whether it will be part of
    the next standard or not, then -ansi -pedantic should warn.

Even if there *isn't* a controversy, we should be implementing the language
as it's *currently* defined, not as we might guess it will be defined in
the future.  I accept that there are some very rare cases when it makes sense
to implement speculatively in cases where it's *very* clear things are about
to be changed, but I don'tsee this as being in that category.