src: fix process.abort() interaction with V8

Since V8 5.9 V8 installs a default signal handler for some signals
when creating a default platform instance that prints a stack trace.

However, Node already does the same thing, so it would seem like the
two different stack traces would be printed; also, the V8 handler
would lead to a `SIGSEGV` under some circumstances, rather than
letting the abort continue normally.

Resolve this by disabling V8’s signal handler by default.

Fixes: #13865

src/node.cc

@@ -247,7 +247,10 @@ node::DebugOptions debug_options;
 static struct {
 #if NODE_USE_V8_PLATFORM
   void Initialize(int thread_pool_size) {
-    platform_ = v8::platform::CreateDefaultPlatform(thread_pool_size);
+    platform_ = v8::platform::CreateDefaultPlatform(
+        thread_pool_size,
+        v8::platform::IdleTaskSupport::kDisabled,
+        v8::platform::InProcessStackDumping::kDisabled);
     V8::InitializePlatform(platform_);
     tracing::TraceEventHelper::SetCurrentPlatform(platform_);
   }

test/abort/test-process-abort-exitcode.js

@@ -0,0 +1,24 @@
+'use strict';
+const common = require('../common');
+const assert = require('assert');
+
+// This test makes sure that an aborted node process
+// exits with code 3 on Windows, and SIGABRT on POSIX.
+// Spawn a child, force an abort, and then check the
+// exit code in the parent.
+
+const spawn = require('child_process').spawn;
+if (process.argv[2] === 'child') {
+  process.abort();
+} else {
+  const child = spawn(process.execPath, [__filename, 'child']);
+  child.on('exit', common.mustCall((code, signal) => {
+    if (common.isWindows) {
+      assert.strictEqual(code, 3);
+      assert.strictEqual(signal, null);
+    } else {
+      assert.strictEqual(code, null);
+      assert.strictEqual(signal, 'SIGABRT');
+    }
+  }));
+}