Assembler auto-complete still freezing on large binaries

[nsadeveloper789]

Describe the bug
Essentially re-opening #2630 based on a new comment from @unknown321. See #2630 (comment)

To Reproduce
Steps to reproduce the behavior:

1. Import large binary
2. Ctrl-Shift-G to patch using assembler
3. Type up to an open [ (I guess that expects a symbol?)
4. UI freezes for approximately 30 seconds

Expected behavior
Responsive UI

Screenshots
(See linked post)

Environment (please complete the following information):

• OS: ??
• Java Version: ?? probably OpenJDK 21
• Ghidra Version: 11.3.1
• Ghidra Origin: ??

[unknown321]

OS: Windows 10
Java: 21.0.6, Amazon Corretto
Ghidra origin: GitHub release