William Huang e45de3dba7 Move RemoveRedundantDbgInstrs outside of inner loop in JumpThreading (#123008) ...

This cleanup action only needs to be performed once when the entire
optimization is converged. Doing it in every iteration has a very high
time-complexity, as it queries every dbg value in a dense map

Compare before and after for one internal source file with many basic
blocks


![image](https://github.com/user-attachments/assets/1dac76a9-a974-4068-9aa1-4041f963fa8e)

![image](https://github.com/user-attachments/assets/73ea2ef1-d1f4-4064-8826-8c13fb539b8d)

>90% reduction in this extreme case.

2025-01-21 20:17:49 -05:00

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