i965: Move hiz resolve to after renderbuffer resizing (v2)

i965: Move hiz resolve to after renderbuffer resizing (v2)

Do all pre-draw hiz resolves *after* the renderbuffers are resized by
intel_prepare_render. Otherwise, we may resolve buffers that are
immediately discarded afterwards.

Fixes the assertion failure below when resizing windows in KDE and under
some unknown circumstance in Chrome OS:
    intel_resolve_map.c:46: intel_resolve_map_set: Assertion
    `(*tail)->need == need' failed.

Also, remove the comment that "resolves must occur [...] before setting up
any hardware state". That was true when resolves were implemented with
meta-ops, but no longer with blorp.

v2:
  - Keep brw_predraw_resolve_buffers in its current position, which is
    before any brw_context bits are modified. Instead, move the call to
    intel_prepare_render.

Note: This is a candiate for the 8.0 branch.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=52252
Reported-by: Lu Hua <huax.lu@intel.com>
Reviewed-by: Paul Berry <stereotype441@gmail.com>
Signed-off-by: Chad Versace <chad.versace@linux.intel.com>