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

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

Change-Id: Ic997e9ab1baed6b2f0c9b6d4846de92ed3c5ac7d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>