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

[Roger Ferrer Ibáñez via llvm-commits]

rofirrim wrote:

> > @dyung if you can revert the change that'd be helpful, so I can investigate. Thanks!
> 
> Oddly it no longer seems to be failing on the bot and I don’t think there was a revert. Perhaps it was some unrelated change? I’ll try to verify today whether it was your change or not that caused the test failures.

Oh, good to know. Thanks a lot @dyung !

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