Merge remote-tracking branch 'remotes/ehabkost/tags/machine-next-pull-request' into...

x86 and machine queue, 2019-10-23

Features:
* Denverton CPU model (Tao Xu)

Cleanups:
* Eliminate remaining places that abuse
  memory_region_allocate_system_memory() (Igor Mammedov)

# gpg: Signature made Thu 24 Oct 2019 03:45:34 BST
# gpg:                using RSA key 5A322FD5ABC4D3DBACCFD1AA2807936F984DC5A6
# gpg:                issuer "ehabkost@redhat.com"
# gpg: Good signature from "Eduardo Habkost <ehabkost@redhat.com>" [full]
# Primary key fingerprint: 5A32 2FD5 ABC4 D3DB ACCF  D1AA 2807 936F 984D C5A6

* remotes/ehabkost/tags/machine-next-pull-request:
  hppa: drop usage of memory_region_allocate_system_memory() for ROM
  ppc: rs6000_mc: drop usage of memory_region_allocate_system_memory()
  sparc64: use memory_region_allocate_system_memory() only for '-m' specified RAM
  target/i386: Introduce Denverton CPU model

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