cgraph: Adjust verify_corresponds_to_fndecl [PR106061]

cgraph: Adjust verify_corresponds_to_fndecl [PR106061]

IPA passes redirect some calls in what it determines to be unreachable code
to builtin_decl_unreachable.  But that function returns sometimes
builtin_decl_explicit (BUILT_IN_UNREACHABLE) (which was what GCC 12
and earlier did always), or builtin_decl_explicit (BUILT_IN_TRAP)
(e.g. for -funreachable-traps, -O0, -Og).
Now the cgraph verification code has a code to verify cgraph edges
and has there an exception for these redirections to BUILT_IN_UNREACHABLE,
but doesn't have for BUILT_IN_TRAP, so e.g. the following testcase
ICEs during that verification.

The following patch just adds BUILT_IN_TRAP to those exceptions.

2023-01-27  Jakub Jelinek  <jakub@redhat.com>

	PR ipa/106061
	* cgraph.cc (cgraph_edge::verify_corresponds_to_fndecl): Allow
	redirection of calls to __builtin_trap in addition to redirection
	to __builtin_unreachable.

	* gcc.dg/pr106061.c: New test.