properly detect v8 version in Deno for prevent deoptimizations

Author: zloirock

packages/core-js/internals/engine-v8-version.js

@@ -2,7 +2,8 @@ var global = require('../internals/global');
 var userAgent = require('../internals/engine-user-agent');
 
 var process = global.process;
-var versions = process && process.versions;
+var Deno = global.Deno;
+var versions = process && process.versions || Deno && Deno.version;
 var v8 = versions && versions.v8;
 var match, version;