Jonas Devlieghere 22d2f7f38e
[lldb] Emit a progress event from the source manager (#165802)
Reading a source file might take a while, for example because it's
located on a virtual file system that's fetching the data on demand.

This PR emits a progress event to convey this to the user when reading
the file exceeds a certain threshold (500ms). Although it doesn't speed
up the operation, it still greatly improves the user experience by
helping them understand what's going on.

rdar://163750392
2025-10-31 13:10:09 -07:00
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