Adjust tests for error reporting on JSON.parse(undefined)

The V8 upgrade changed the stacktrace reports (?)

test/simple/test-error-reporting.js

@@ -36,13 +36,13 @@ errExec('throws_error.js', function (err, stdout, stderr) {
 
 // Trying to JSON.parse(undefined)
 errExec('throws_error2.js', function (err, stdout, stderr) {
-  assert.ok(/JSON/.test(stderr));
+  assert.ok(/SyntaxError/.test(stderr));
 });
 
 
 // Trying to JSON.parse(undefined) in nextTick
 errExec('throws_error3.js', function (err, stdout, stderr) {
-  assert.ok(/JSON/.test(stderr));
+  assert.ok(/SyntaxError/.test(stderr));
 });