Match explicit section names and not .{text,data}.* for example.

This test now passes on hppa.

Make the dummy data that we expect to go into .data section bigger,
otherwise on e.g. alpha it goes into the "small objects data" .sdata
section, which confuses the matching done in this test.

Merge tests.

Fix thinko in previous.

Test __start_xxx/__stop_xxx symbol generation.