Fix LLVM optimization bug causing infinite build on Apple Silicon #403
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LLVM's InterleavedLoadCombine pass triggers infinite recursion when compiling BitNet's vector shuffle patterns on Apple Silicon, causing builds to hang indefinitely. This affects both Apple Clang and Homebrew Clang (reported with versions 17.0.0 through 20.1.6). Added -mllvm -disable-interleaved-load-combine to CMAKE_C_FLAGS and CMAKE_CXX_FLAGS, scoped to Darwin + arm64 only. Fixes microsoft#294
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Summary
-mllvm -disable-interleaved-load-combinecompiler flags tosetup_env.pyfor macOS ARM64 buildsInterleavedLoadCombineoptimization pass triggers infinite recursion on Apple Silicon when compiling BitNet's vector shuffle patterns, causing the build to hang indefinitelyDarwin + arm64only, so it does not affect x86, Linux, or Windows buildsRelated issues
Test plan
python setup_env.py -md models/BitNet-b1.58-2B-4T -q i2_son Apple Silicon Mac — verify build completes in minutes, not hoursFixes #294