asan: Don't instrument .ABNORMAL_DISPATCHER [PR114743]

asan: Don't instrument .ABNORMAL_DISPATCHER [PR114743]

.ABNORMAL_DISPATCHER is currently the only internal function with
ECF_NORETURN, and asan likes to instrument ECF_NORETURN calls by adding
some builtin call before them, which breaks the .ABNORMAL_DISPATCHER
discovery added in gsi_safe_*.

The following patch fixes asan not to instrument .ABNORMAL_DISPATCHER
calls, like it doesn't instrument a couple of specific builtin calls
as well.

2024-04-17  Jakub Jelinek  <jakub@redhat.com>

	PR sanitizer/114743
	* asan.cc (maybe_instrument_call): Don't instrument calls to
	.ABNORMAL_DISPATCHER.

	* gcc.dg/asan/pr112709-2.c (freddy): New function from
	gcc.dg/ubsan/pr112709-2.c version of the test.