test: improve flakiness detection on stack corruption tests

This change skips asserting the exit code of the child process with the
corrupted async hooks stack only on those platforms where termination
via a signal has been observed.

Refs: #58478 (comment)
Signed-off-by: Darshan Sen <raisinten@gmail.com>

Author: RaisinTen

test/async-hooks/test-emit-after-on-destroyed.js

@@ -53,9 +53,12 @@ if (process.argv[2] === 'child') {
   child.stdout.on('data', (d) => { outData = Buffer.concat([ outData, d ]); });
 
   child.on('close', common.mustCall((code, signal) => {
-    if (signal) {
-      console.log(`Child closed with signal: ${signal}`);
+    if ((common.isAIX ||
+         (common.isLinux && process.arch === 'x64')) &&
+         signal === 'SIGABRT') {
+      // XXX: The child process could be aborted due to unknown reasons. Work around it.
     } else {
+      assert.strictEqual(signal, null);
       assert.strictEqual(code, 1);
     }
     assert.match(outData.toString(), heartbeatMsg,

test/async-hooks/test-improper-unwind.js

@@ -56,9 +56,12 @@ if (process.argv[2] === 'child') {
   child.stdout.on('data', (d) => { outData = Buffer.concat([ outData, d ]); });
 
   child.on('close', common.mustCall((code, signal) => {
-    if (signal) {
-      console.log(`Child closed with signal: ${signal}`);
+    if ((common.isAIX ||
+         (common.isLinux && process.arch === 'x64')) &&
+         signal === 'SIGABRT') {
+      // XXX: The child process could be aborted due to unknown reasons. Work around it.
     } else {
+      assert.strictEqual(signal, null);
       assert.strictEqual(code, 1);
     }
     assert.match(outData.toString(), heartbeatMsg,