[clang] [driver] Respect the mode the driver is in for autocomplete (PR #74770)

[Andrzej Warzyński via cfe-commits]

banach-space wrote:

The current setting pre-dates the visibility flags, so it makes sense that it wouldn't be needed anymore. This change makes sense to me, but it would be nice to verify.

> I don't see any testing in tree for anything except clang

What tests do you see in Clang for this specifically? Tests for Flang driver are located here:
* https://github.com/llvm/llvm-project/tree/main/flang/test/Driver

https://github.com/llvm/llvm-project/pull/74770