[Bug driver/78957] New: ICE: SIGSEGV with -fno-sso-struct=web

["zsojka at seznam dot cz" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78957

            Bug ID: 78957
           Summary: ICE: SIGSEGV with -fno-sso-struct=web
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: driver
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---

Likely similar to PR78933

Compiler output:
$ valgrind x86_64-pc-linux-gnu-gcc /dev/null -o /dev/null -fno-sso-struct=web
==24593== Invalid read of size 8
==24593==    at 0x51972C: pp_format(pretty_printer*, text_info*)
(pretty-print.c:317)
==24593==    by 0x4DEF55: diagnostic_report_diagnostic(diagnostic_context*,
diagnostic_info*) (diagnostic.c:961)
==24593==    by 0x4E1B78: diagnostic_impl (diagnostic.c:1084)
==24593==    by 0x4E1B78: internal_error(char const*, ...) (diagnostic.c:1395)
==24593==    by 0x4DD13B: fancy_abort(char const*, int, char const*)
(diagnostic.c:1461)
==24593==    by 0x496AD7: decode_cmdline_option (opts-common.c:671)
==24593==    by 0x496AD7: decode_cmdline_options_to_array(unsigned int, char
const**, unsigned int, cl_decoded_option**, unsigned int*) (opts-common.c:836)
==24593==    by 0x4034FF: driver::main(int, char**) (gcc.c:7209)
==24593==    by 0x4039BB: main (gcc-main.c:46)
==24593==  Address 0x8 is not stack'd, malloc'd or (recently) free'd