[clang] [flang] [llvm] [mlir] [Support][NFC] Move OptimizationLevel to the Support directory (PR #157057)

[Sergei Barannikov via cfe-commits]

s-barannikov wrote:

And what's wrong with Passes anyway?

> Given that code is much more likely to depend upon Support than Passes I believe it makes sense to move OptimizationLevel to Support.

This doesn't look a very strong point to me. We could say this about nearly everything and move it all to Support :)


https://github.com/llvm/llvm-project/pull/157057