Merge remote-tracking branch 'remotes/xtensa/tags/20200407-xtensa' into staging

target/xtensa fixes for 5.0:

- fix pasto in pfwait.r opcode name;
- fix memory leak with dynamically allocated xtensa_insnbufs in
  DisasContext.

# gpg: Signature made Wed 08 Apr 2020 00:58:05 BST
# 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/20200407-xtensa:
  target/xtensa: statically allocate xtensa_insnbufs in DisasContext
  target/xtensa: fix pasto in pfwait.r opcode name

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