Gavin Peng 6471893f59 Multithread CPU naive mesh rasterization
Summary:
Threaded the for loop:
```
for (int yi = 0; yi < H; ++yi) {...}
```
in function `RasterizeMeshesNaiveCpu()`.
Chunk size is approx equal.

Reviewed By: bottler

Differential Revision: D40063604

fbshipit-source-id: 09150269405538119b0f1b029892179501421e68
2022-10-06 06:42:58 -07:00
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