[llvm-branch-commits] [clang] [llvm] Backport "riscv-isa" module metadata to 18.x (PR #91514)

[Eli Friedman via llvm-branch-commits]

efriedma-quic wrote:

If LTO was completely broken, this seems worth taking.  And the changes look safe. LGTM.

https://github.com/llvm/llvm-project/pull/91514