[Bug c++/70909] Libiberty Demangler segfaults (4)

[matt at godbolt dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70909

--- Comment #14 from Matt Godbolt <matt at godbolt dot org> ---
Created attachment 40101
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40101&action=edit
compile with gcc 6.2 -std=c++14

This reproduces the issue. Compile with g++ 6.2 and -std=c++14 to create a file
which contains the symbol:

_ZSt7forwardIR17predicate_matcherIZ11any_matcherIiEDavEUlOT_E_13typed_matcherIiEEES3_RNSt16remove_referenceIS2_E4typeE

This symbol crashes both c++filt (2.26.20160125) and gdb (7.10) in the same way
as this bug describes (d_print_comp infinite recursion).