test: add SIGTRAP to test-signal-handler

Backport-PR-URL: #38051
Co-authored-by: BoHong Li <a60814billy@gmail.com>
PR-URL: #36368
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>

Author: Ash Cripps

test/abort/test-signal-handler.js

@@ -18,6 +18,6 @@ if (process.argv[2] === 'child') {
 ['--expose-internals',__filename,'child'],
 {stdio: 'inherit'});
 // FreeBSD and macOS use SIGILL for the kind of crash we're causing here.
-assert(child.signal==='SIGSEGV'||child.signal==='SIGILL',
-`child.signal = ${child.signal}`);
+assert(child.signal==='SIGSEGV'||child.signal==='SIGILL'||
+child.signal==='SIGTRAP',`child.signal = ${child.signal}`);
 }