[clang] [llvm] [CodeGen][clang] Use module metadata to mark hotpatchable modules (PR #142969)

[Jacek Caban via llvm-commits]

cjacek wrote:

I originally needed this commit to write a test case for #142970, when I was emitting the compiler info conditionally. Once we decided to enable it unconditionally, I could use a non-hotpatchable input in the test case, so this PR was no longer necessary.

That said, being able to specify hotpatch in tests may still be useful at some point. I’ll rebase the PR, but I don’t mind dropping it if you think it’s not worth changing.

https://github.com/llvm/llvm-project/pull/142969