[llvm] [RISCV] Lower llvm.clear_cache to __riscv_flush_icache for glibc targets (PR #93481)

[Roger Ferrer Ibáñez via llvm-commits]

rofirrim wrote:

> Our Windows build also seems to be seeing similar failures as the `llvm-nvptx-nvidia-win` builder https://lab.llvm.org/buildbot/#/builders/46/builds/312

I'll take a look. Thanks for the heads up.

https://github.com/llvm/llvm-project/pull/93481