[llvm] [Opt] Enable statically-linked plugin support (PR #79227)

[Eli Friedman via llvm-commits]

efriedma-quic wrote:

Rename main() to OptDriverMain(), add a new file opt-executable.cpp that's a wrapper around it.  Add whatever parameters you need to OptDriverMain().

Alternatively, adding a global variable to opt.cpp isn't that terrible.  We want to avoid global variables in core libraries so we don't have issues with shared state, but I wouldn't expect opt-driver to be used in that sort of context.

https://github.com/llvm/llvm-project/pull/79227