fix a memory leak in profiling, add a profiling test

parser.cpp

@@ -2460,7 +2460,7 @@ void parser_t::eval_job(tokenizer_t *tok)
                 if (do_profile)
                 {
                     t2 = get_time();
-                    profile_item->cmd = wcsdup(j->command_wcstr());
+                    profile_item->cmd = j->command();
                     profile_item->skipped=current_block->skip;
                 }
 

tests/test.fish

@@ -32,6 +32,12 @@ if [ "$argv" != '-n' ]
 	echo Exit status differs for file test.fish
   end
 
+  ../fish -p /dev/null -c 'echo testing' >/dev/null
+  if test $status -ne 0
+	set res fail
+	echo Profiling fails
+  end
+
   if test $res = ok;
 	echo File test.fish tested ok
   else