[compiler-rt] [compiler-rt][RISCV] Implement __riscv_ifunc_select (PR #85790)

[Wang Pengcheng via llvm-commits]

wangpc-pp wrote:

Are there any processes for GNU/GCC implementation? If we want to port glibc, I think it should be required.

https://github.com/llvm/llvm-project/pull/85790