Improve multires performance.

Added a new api function to stich multires grids
on specific faces in a mesh,
subdiv_ccg_average_faces_boundaries_and_corners,
and changed multires normal calc to use it.

VTune profiling showed that this was a major
performance hit once you get above 10,000 or so
base mesh faces and/or have a high number of
subdivision levels.

Here's a video comparing the difference. Note the
bpy.app_debug switch is not in the final commit.

{F10145323}

And the .blend file:

{F10145346}

Reviewed By: Sergey Sharybin (sergey)

Differential Revision:
https://developer.blender.org/D11334

3 files changed, 0 insertions, 0 deletions

diff --git a/release/datafiles/locale b/release/datafiles/locale
-Subproject 2cef4877edc40875978c4e95322bb5193f5815b
+Subproject 4833954c0ac85cc407e1d5a153aa11b1d1823ec
diff --git a/release/scripts/addons b/release/scripts/addons
-Subproject 27fe7f3a4f964b53af436c4da4ddea337eff0c7
+Subproject e25068ef471c6d6cd5ee64a2eef9b7d672c5702
diff --git a/release/scripts/addons_contrib b/release/scripts/addons_contrib
-Subproject 5a82baad9f986722104280e8354a4427d8e9eab
+Subproject 7d78c8a63f2f4b146f9327ddc0d567a5921b94e