enhance inline & unused (#5245)

test/mocha/spidermonkey.js

@@ -1,14 +1,26 @@
 var assert = require("assert");
 var exec = require("child_process").exec;
+var semver = require("semver");
 var UglifyJS = require("../..");
 
 describe("spidermonkey export/import sanity test", function() {
     it("Should produce a functional build when using --self with spidermonkey", function(done) {
         this.timeout(120000);
         var uglifyjs = '"' + process.argv[0] + '" bin/uglifyjs';
+        var options = semver.satisfies(process.version, "<=0.12") ? "-mc hoist_funs" : "-mc";
         var command = [
-            uglifyjs + " --self -cm --wrap SpiderUglify -o spidermonkey",
-            uglifyjs + " -p spidermonkey -cm",
+            [
+                uglifyjs,
+                "--self",
+                options,
+                "--wrap SpiderUglify",
+                "-o spidermonkey",
+            ].join(" "),
+            [
+                uglifyjs,
+                "-p spidermonkey",
+                options,
+            ].join(" "),
         ].join(" | ");
         exec(command, { maxBuffer: 1048576 }, function(err, stdout) {
             if (err) throw err;