gaaclarke 77941b98d5 [Impeller] improved glyph hashing performance (flutter/engine#44502) ...

This change makes the glyph hash 39% faster (66ms vs 107ms).  The glyph hash function occupies the most CPU time on the raster thread when scrolling around the main screen for the Flutter Gallery

## before

<img width="1101" alt="Screenshot 2023-08-08 at 10 53 06 AM" src="https://github.com/flutter/engine/assets/30870216/2332323e-80cd-4f39-9ec1-95cb5662be7b">

## after
<img width="1097" alt="Screenshot 2023-08-08 at 10 52 51 AM" src="https://github.com/flutter/engine/assets/30870216/13bbc07b-7f56-40e8-ada5-32de77ddf614">

[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style

2023-08-08 18:44:21 +00:00

..

src/flutter

[Impeller] improved glyph hashing performance (flutter/engine#44502)

2023-08-08 18:44:21 +00:00