testsuite, simulators, and argv[0]

[DJ Delorie]

gcc.c-torture/execute/pr36321.c fails on m32c because the simulator
doesn't set argv[0] *and* the simulator has NULL pointer detection:

        void foo(char *str)
        {
          int len2 = strlen (str);
          . . .

        int main(int argc, char **argv)
        {
          foo (argv[0]);

What are the expectations here?  Do we expect simulators to set up
argv[0]? (the m32c BSP acts like you're on real hardware)  Do we expect
simulators to blithely ignore NULL pointer references?