[clang] [llvm] [llvm] Fix the MCSubtargetInfo used for module-level assembly. (PR #97685)

[Peter Collingbourne via cfe-commits]

pcc wrote:

> Isn't #174995 the agreed upon direction to fix this?

That change seems to have some problems as I just noted in a comment there. This workaround is simpler at least, and avoids adding unnecessary data to the IR.

https://github.com/llvm/llvm-project/pull/97685