tools: update tick processor for V8 embedder version

Update the processor to accept a V8 with or without an embedder version
string.

lib/internal/v8_prof_polyfill.js

@@ -82,14 +82,16 @@ function readline() {
 }
 
 function versionCheck() {
-  // v8-version looks like "v8-version,$major,$minor,$build,$patch,$candidate"
+  // v8-version looks like
+  // "v8-version,$major,$minor,$build,$patch[,$embedder],$candidate"
   // whereas process.versions.v8 is either "$major.$minor.$build" or
   // "$major.$minor.$build.$patch".
   var firstLine = readline();
   line = firstLine + '\n' + line;
   firstLine = firstLine.split(',');
   const curVer = process.versions.v8.split('.');
-  if (firstLine.length !== 6 && firstLine[0] !== 'v8-version') {
+  if (firstLine.length !== 6 && firstLine.length !== 7 ||
+      firstLine[0] !== 'v8-version') {
     console.log('Unable to read v8-version from log file.');
     return;
   }