[Bug demangler/80513] demangler walks past trailing nul in mangled name in a bunch of cases

[richard-gccbugzilla at metafoo dot co.uk]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80513

--- Comment #1 from Richard Smith <richard-gccbugzilla at metafoo dot co.uk> ---
While we're here, this check for overflow in consume_count is nonsense, and any
decent optimising compiler is going to optimise away the overflow check:

https://github.com/gcc-mirror/gcc/blob/master/libiberty/cplus-dem.c#L525

Testcase:

$ echo '_Z4294967297x' | c++filt
x

Oops.


It looks like item 2 in comment#0 was fixed recently
(https://github.com/gcc-mirror/gcc/commit/b2dcfe3da47412480529c8591ba0433cd495fbe3)
but item 1 is still live.