stage2 compiler-rt build fails on X86_64 MacOS GitHub runners

[tstellar]

I'm trying to do release builds on the x86_64 MacOS GitHub runners, and the stage2 compiler-rt build is failing with errors like:

fatal error: /Applications/Xcode_15.2.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/lipo: /var/folders/80/7d6cd1d13n9by5z92zm5q2mr0000gn/T/lsan_common-429870/lsan_common-x86_64.out and /var/folders/80/7d6cd1d13n9by5z92zm5q2mr0000gn/T/lsan_common-f0ff7a/lsan_common-x86_64h.out have the same architectures (x86_64) and can't be in the same fat output file

The full log can be found here.

I am able to work around this by passing the following CMake options:

-DBOOTSTRAP_COMPILER_RT_ENABLE_IOS=OFF 
-DBOOTSTRAP_DARWIN_osx_ARCHS=x86_64  
-DBOOTSTRAP_DARWIN_osx_BUILTIN_ARCHS=x86_64

How to Reproduce

cmake -G Ninja -S llvm -B build \
    -DLLVM_RELEASE_ENABLE_PGO=OFF 
    -DLLVM_RELEASE_ENABLE_PROJECTS="clang;lld;lldb;clang-tools-extra;bolt;polly;mlir" \
    -C clang/cmake/caches/Release.cmake

ninja -C build stage2-package