intel: Add map_stencil_as_y_tiled to intel_region_get_aligned_offset.

This patch modifies intel_region_get_aligned_offset() to make the
appropriate calculation when the blorp engine sets up a W-tiled
stencil buffer using a Y-tiled SURFACE_STATE.

NOTE: This is a candidate for stable release branches.

Acked-by: Eric Anholt <eric@anholt.net>

src/mesa/drivers/dri/intel/intel_fbo.c

@@ -586,7 +586,7 @@ intel_renderbuffer_tile_offsets(struct intel_renderbuffer *irb,
    *tile_x = irb->draw_x & mask_x;
    *tile_y = irb->draw_y & mask_y;
    return intel_region_get_aligned_offset(region, irb->draw_x & ~mask_x,
-                                          irb->draw_y & ~mask_y);
+                                          irb->draw_y & ~mask_y, false);
 }
 
 /**