[Bug ipa/86274] [7/8/9 Regression] SEGFAULT when logging std::to_string(NAN)

[jamborm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86274

--- Comment #9 from Martin Jambor <jamborm at gcc dot gnu.org> ---
As early as the ssa dump we have, in the same function,

  <bb 3> :
  __len_13 = _12;
  __builtin_va_end (&__args);
  std::allocator<char>::allocator (&D.122645);
  _1 = (sizetype) __len_13;
  _2 = __s_7 + _1;
  std::__cxx11::basic_string<char>::basic_string<char*> (_16(D), __s_7, _2,
&D.122645);

i.e. construction of basic_string<char> at an undefined address.