Merge remote-tracking branch 'remotes/ehabkost/tags/x86-pull-request' into staging

Merge remote-tracking branch 'remotes/ehabkost/tags/x86-pull-request' into staging

X86 queue, 2015-10-23

# gpg: Signature made Fri 23 Oct 2015 16:30:58 BST using RSA key ID 984DC5A6
# gpg: Good signature from "Eduardo Habkost <ehabkost@redhat.com>"

* remotes/ehabkost/tags/x86-pull-request:
  vl: trivial: minor tweaks to a max-cpu error msg
  target-i386: Use 1UL for bit shift
  target-i386: Add DE to TCG_FEATURES
  target-i386: Ensure always-1 bits on DR6 can't be cleared
  target-i386: Check CR4[DE] for processing DR4/DR5
  target-i386: Handle I/O breakpoints
  target-i386: Optimize setting dr[0-3]
  target-i386: Move hw_*breakpoint_* functions
  target-i386: Ensure bit 10 on DR7 is never cleared
  target-i386: Re-introduce optimal breakpoint removal
  target-i386: Introduce cpu_x86_update_dr7
  target-i386: Disable cache info passthrough by default
  target-i386: allow any alignment for SMBASE

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