!UPSTREAM: handle non-redundant clears correctly
Revert "intel: Create intel_miptree_get_region() to prepare for fast color clear."

This reverts commit 2597251d464d59151e38553ed68ffe1489f8f210.

Conflicts:
	src/mesa/drivers/dri/intel/intel_mipmap_tree.h
	src/mesa/drivers/dri/intel/intel_screen.c
	src/mesa/drivers/dri/intel/intel_tex_image.c
Fixups
!UPSTREAM: more resolve stuff I forgot