[Bug gdb/17157] New: GDB segfault when demangling symbol

["sourceware at ca dot sh13.net" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17157

            Bug ID: 17157
           Summary: GDB segfault when demangling symbol
           Product: gdb
           Version: 7.7
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: sourceware at ca dot sh13.net

Created attachment 7712
  --> https://sourceware.org/bugzilla/attachment.cgi?id=7712&action=edit
Repro-Case

The following symbol fails to demangle with GDB 7.7.1 (built from source.)
Comes from Code compiled with GCC 4.8.2 on Ubuntu 14.04. Also fails on
distro-provided GDB (7.7.)

"_ZNK5niven5ColorIfLi4EEdvIfEENSt9enable_ifIXsrSt13is_arithmeticIT_E5valueEKNS0_IDTmlcvS5__Ecvf_EELi4EEEE4typeES5_"

c++filt correctly demangles this to:

std::enable_if<std::is_arithmetic<float>::value, niven::Color<decltype
(((float)())*((float)())), 4> const>::type niven::Color<float,
4>::operator/<float>(float) const

For the repro-case, assuming it has been put into the GDB source root directory
and GDB is built, use: gcc -Iinclude/ test.c ./libiberty/libiberty.a -o test

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