Use js_free on fresh slots instead of js_delete (bug 793385, r=billm).

js/src/jit-test/tests/bug793385.js

@@ -0,0 +1,9 @@
+// |jit-test| error: out of memory
+gcparam("maxBytes", gcparam("gcBytes") + 4*1024);
+function f() {
+    var inner4 = f("get"),
+	x1,x2,x3,x4,x5,x11,x12,x13,x14,x15,x16,x17,x18,
+        otherGlobalSameCompartment = newGlobal("same-compartment");
+    eval('');
+}
+assertEq("aaa".replace(/a/g, f()), "poniesponiesponies");

js/src/vm/ScopeObject.cpp

@@ -170,7 +170,7 @@ CallObject::createTemplateObject(JSContext *cx, JSScript *script)
 
     CallObject *callobj = CallObject::create(cx, shape, type, slots);
     if (!callobj) {
-        js_delete(slots);
+        js_free(slots);
         return NULL;
     }