Merge remote-tracking branch 'filippov/tags/20131108-xtensa' into staging

Two small fixes for 1.7:

- add missing debug feature to dc233c xtensa core;
- fix qemu abort caused by gdb attempt to invalidate a breakpoint by
  virtual address for which there's no mapping.

# gpg: Signature made Thu 07 Nov 2013 09:32:19 PM PST using RSA key ID F83FA044
# gpg: Can't check signature: public key not found

# By Max Filippov
# Via Max Filippov
* filippov/tags/20131108-xtensa:
  target-xtensa: add missing DEBUG section to dc233c config
  exec: fix breakpoint_invalidate when pc may not be translated

Message-id: 1383889643-21621-1-git-send-email-jcmvbkbc@gmail.com
Signed-off-by: Anthony Liguori <aliguori@amazon.com>