Jonah Williams b06489fa4b [Impeller] Emplace directly into host buffer (avoid VBB) for text data (flutter/engine#42484) ...

From local testing, this shaves off about 0.3-4 ms of pure allocation overhead from https://github.com/flutter/flutter/issues/127760

### Before

![image](https://github.com/flutter/engine/assets/8975114/55701559-fba8-4f11-b606-f819d197626e)

### After

![image](https://github.com/flutter/engine/assets/8975114/b6843c13-d6c7-4364-86b1-c78e216307b3)

2023-06-01 22:34:58 +00:00

..

src/flutter

[Impeller] Emplace directly into host buffer (avoid VBB) for text data (flutter/engine#42484)

2023-06-01 22:34:58 +00:00