[libc][RISCV] Add log, log2, log1p, log10 for RISC-V64 entrypoints.

Add log, log2, log1p, log10 RISCV64 entrypoints.

Reviewed By: michaelrj, sivachandra

Differential Revision: https://reviews.llvm.org/D151674

GitOrigin-RevId: e557b8a14247ad58ec20ff82612de852155f77ad
2 files changed