Merge remote-tracking branch 'remotes/xtensa/tags/20190326-xtensa' into staging

target/xtensa fixes for v4.0:

- fix translation of FLIX bundles with multiple references to the same
  register;
- don't announce exit simcall;
- clean up tests/tcg/xtensa.

# gpg: Signature made Tue 26 Mar 2019 17:58:59 GMT
# gpg:                using RSA key 2B67854B98E5327DCDEB17D851F9CC91F83FA044
# gpg:                issuer "jcmvbkbc@gmail.com"
# gpg: Good signature from "Max Filippov <filippov@cadence.com>" [unknown]
# gpg:                 aka "Max Filippov <max.filippov@cogentembedded.com>" [full]
# gpg:                 aka "Max Filippov <jcmvbkbc@gmail.com>" [full]
# Primary key fingerprint: 2B67 854B 98E5 327D CDEB  17D8 51F9 CC91 F83F A044

* remotes/xtensa/tags/20190326-xtensa:
  tests/tcg/xtensa: clean up test set
  target/xtensa: don't announce exit simcall
  target/xtensa: fix break_dependency for repeated resources

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>