Similar to r255816, fix the math for the DELAY() calculation.  It was off
by a really small amount because of the higher timer resolution.

Approved by:	adrian (mentor)
Verified on:	BBB
Pull in r196658 from upstream clang trunk:

  CodeGen: Don't emit linkage on thunks that aren't emitted because they're
  vararg.

  This can happen when we're trying to emit a thunk with available_externally
  linkage with optimization enabled but bail because it doesn't make sense for
  vararg functions.

  [LLVM] PR18098.

This should fix clang "Broken module found, compilation aborted" errors when
building the qt4-based dvbcut port.

Reported by:	se
MFC after:	3 days
drm/radeon: agp_info->ai_aperture_size is in bytes, not Mbytes

This fixes radeon_agp_init() and gtt_size is now correct. However, this
is not enough to make Radeon AGP cards work: ttm_agp_backend.c isn't
implemented yet.

Submitted by:	tijl@