[clang] [clang-tools-extra] [flang] [lldb] [llvm] Reapply "[clang] Refactor to remove clangDriver dependency from clangFrontend and flangFrontend (#165277)" (PR #169599)

[Walter Lee via cfe-commits]

googlewalt wrote:

Thanks for the heads up.  It's fine if bazel breaks; we can sort it out after commit.

https://github.com/llvm/llvm-project/pull/169599