[clang] [RISCV] Add -march string as Module metadata in IR. (PR #80760)

[Craig Topper via cfe-commits]

topperc wrote:

> I'm surprised only 1 test file needed the metadata updated as a result of this change.

Maybe other tests are better about using regexes to hide the numbers?

https://github.com/llvm/llvm-project/pull/80760