Merge "risc-v: use clang's builtins for more of libm." am: 98886bb28d am: b2aef2641b

Original change: https://android-review.googlesource.com/c/platform/bionic/+/2503695

Change-Id: I58dce1ee355e86d8e9c68f5b3b575c96c810d3fd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>