Node.js different versions cause parsing issues

[MrMinemeet]

When an application is profiled using Node.js vX and is then processed using Node.js vY, then it will add the following line as a prefix to the output log: Testing v8 version different from logging version

So it may look like this:

Testing v8 version different from logging version
{
  "code": [
  {
     …

It seems to be fine to remove that warning and load it into speedscope again.