[Bug c++/20020] GDB segfault on printing objects

[ppluzhnikov at google dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=20020

Paul Pluzhnikov <ppluzhnikov at google dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |ppluzhnikov at google dot com

--- Comment #15 from Paul Pluzhnikov <ppluzhnikov at google dot com> ---
Another trivial reproducer from
https://stackoverflow.com/questions/55314720/gdb-crashes-when-printing-value-of-atomic-enum

#include <atomic>

enum class foo {ONE, TWO, THREE, FOUR, FIVE, SIX};

int main(int argc, char **argv)
{
  std::atomic<foo> x = foo::FOUR;
  std::atomic<int> y = int(foo::FOUR);
  return 0;
}

g++ -g -std=c++17 t.cc

(gdb) print y -- works fine
(gdb_ print x -- crash in value_entirely_covered_by_range_vector(), using
current trunk.

value_entirely_covered_by_range_vector (value=value@entry=0x0, ranges=...) at
../../gdb/value.c:416
416       if (value->lazy)

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