test: make test-buffer-slow engine agnostic

Do not check the error message if it is generated by the JavaScript
engine (V8, ChakraCore, etc.). Do confirm that it is a `RangeError`.

PR-URL: https://github.com/nodejs/node/pull/16272
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

test/parallel/test-buffer-slow.js

@@ -34,7 +34,9 @@ try {
   assert.strictEqual(
     SlowBuffer(buffer.kMaxLength).length, buffer.kMaxLength);
 } catch (e) {
-  assert.strictEqual(e.message, 'Array buffer allocation failed');
+  // Don't match on message as it is from the JavaScript engine. V8 and
+  // ChakraCore provide different messages.
+  assert.strictEqual(e.name, 'RangeError');
 }
 
 // should work with number-coercible values