Summary: These functions were implemented via builtins that aren't acually supported. See https://godbolt.org/z/Wq6q6T1za. This caused the build to crash if they were included. Remove these and replace with correct implementations.
LLVM libc ========= This directory and its subdirectories contain source code for llvm-libc, a retargetable implementation of the C standard library. LLVM is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt.