Merge remote-tracking branch 'remotes/aurel/tags/pull-target-sh4-20170530' into staging

Queued target/sh4 patches

# gpg: Signature made Tue 30 May 2017 20:12:10 BST
# gpg:                using RSA key 0xBA9C78061DDD8C9B
# gpg: Good signature from "Aurelien Jarno <[email protected]>"
# gpg:                 aka "Aurelien Jarno <[email protected]>"
# gpg:                 aka "Aurelien Jarno <[email protected]>"
# gpg: WARNING: This key is not certified with sufficiently trusted signatures!
# gpg:          It is not certain that the signature belongs to the owner.
# Primary key fingerprint: 7746 2642 A9EF 94FD 0F77  196D BA9C 7806 1DDD 8C9B

* remotes/aurel/tags/pull-target-sh4-20170530:
  target/sh4: fix RTE instruction delay slot
  target/sh4: ignore interrupts in a delay slot
  target/sh4: introduce DELAY_SLOT_MASK
  target/sh4: fix reset when using a kernel and an initrd
  target/sh4: log unauthorized accesses using qemu_log_mask

Signed-off-by: Peter Maydell <[email protected]>