[Bug c++/87250] Internal compiler error with -Os -fsyntax-only

[mbelivea at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87250

--- Comment #2 from Matthew Beliveau <mbelivea at redhat dot com> ---
Reduced code:

template <typename> struct a {
  constexpr a(int) {}
};
template <typename> struct atomic;
template <> struct atomic<bool> {
  a<bool> b;
  constexpr atomic(bool c) : b(c) {}
};

~/bld/gcc7/gcc/cc1plus k.ii -Os -fsyntax-only 
 constexpr a< <template-parameter-1-1> >::a(int) a<bool> constexpr
atomic<bool>::atomic(bool) constexpr a< <template-parameter-1-1> >::a(int)
[with <template-parameter-1-1> = bool] constexpr a< <template-parameter-1-1>
>::a(int) [with <template-parameter-1-1> = bool] constexpr a<
<template-parameter-1-1> >::a(int) [with <template-parameter-1-1> = bool]
constexpr atomic<bool>::atomic(bool) constexpr atomic<bool>::atomic(bool)
constexpr a< <template-parameter-1-1> >::a(int) [with <template-parameter-1-1>
= bool]
k.ii:8:2: internal compiler error: Segmentation fault
 };
  ^
0x113a4c5 crash_signal
        /home/mbeliveau/src/gcc7/gcc/toplev.c:337
0xa08a48 maybe_clone_body(tree_node*)
        /home/mbeliveau/src/gcc7/gcc/cp/optimize.c:659
0x9bd5d9 expand_or_defer_fn_1(tree_node*)
        /home/mbeliveau/src/gcc7/gcc/cp/semantics.c:4287
0x9bd6da expand_or_defer_fn(tree_node*)
        /home/mbeliveau/src/gcc7/gcc/cp/semantics.c:4309
0x8cb0fd c_parse_final_cleanups()
        /home/mbeliveau/src/gcc7/gcc/cp/decl2.c:4727
0xaf208b c_common_parse_file()
        /home/mbeliveau/src/gcc7/gcc/c-family/c-opts.c:1134
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