* gdb.base/watchpoint.exp (no_hw): New global.
(maybe_clean_restart, maybe_reinitialize): If no_hw is set,
disable hw watchpoints.
(test_wide_location_1, test_wide_location_2): If no_hw is set,
don't expect hw watchpoints.
(no_hw_watchpoints): Always clean restart.
(do_tests): New procedure, factored out from the top level.
(top level): Run tests twice. Once with hw watchpoints enabled,
another time with hw watchpoints disabled.
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