restart GDB for h8300 after a continue.
(return): Add pattern to match a29k-udi behavior.
* gdb.base/nodebug.exp: Remove obsolete comment.
* gdb.base/regs.exp: New file, testing of register displays.
* gdb.base/return.exp: Fix typo in reference to $objdir.
* gdb.base/whatis.exp: Always start with a fresh GDB.
