From https://build.chromium.org/p/chromium.fyi/builders/ClangToTMac/builds/15036

Probably due to r314284


539/4121] Building ASM object lib/builtins/CMakeFiles/clang_rt.builtins_armv7k_ios.dir/arm/aeabi_cdcmp.S.o
FAILED: lib/builtins/CMakeFiles/clang_rt.builtins_armv7k_ios.dir/arm/aeabi_cdcmp.S.o 
/Applications/Xcode8.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc    -O3 -DNDEBUG    -isysroot /Applications/Xcode8.0.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS10.0.sdk -miphoneos-version-min=6.0 -fPIC -O3 -fvisibility=hidden -DVISIBILITY_HIDDEN -Wall  -arch armv7k -MMD -MT lib/builtins/CMakeFiles/clang_rt.builtins_armv7k_ios.dir/arm/aeabi_cdcmp.S.o -MF lib/builtins/CMakeFiles/clang_rt.builtins_armv7k_ios.dir/arm/aeabi_cdcmp.S.o.d -o lib/builtins/CMakeFiles/clang_rt.builtins_armv7k_ios.dir/arm/aeabi_cdcmp.S.o -c /b/c/builder/ClangToTMac/src/third_party/llvm/compiler-rt/lib/builtins/arm/aeabi_cdcmp.S
/b/c/builder/ClangToTMac/src/third_party/llvm/compiler-rt/lib/builtins/arm/aeabi_cdcmp.S:83:9: error: unsupported relocation on symbol
        bne __aeabi_cdcmple
        ^