Merge pull request #3900 from Schamper/debug-fix

Also clean the minifier process options if the --debug option is used

src/meta/js.js

@@ -129,7 +129,7 @@ module.exports = function(Meta) {
 			 * Check if the parent process is running with the debug option --debug (or --debug-brk)
 			 */
 			var forkProcessParams = {};
-			if(global.v8debug) {
+			if(global.v8debug || process.execArgv.indexOf('--debug') != -1) {
 				/**
 				 * use the line below if you want to debug minifier.js script too (or even --debug-brk option, but
 				 * you'll have to setup your debugger and connect to the forked process)