[clang] [llvm] [MFS] Implement -fsplit-machine-functions for Mach-O (ARM64) (PR #179449)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- clang/lib/Driver/ToolChains/Clang.cpp llvm/include/llvm/CodeGen/TargetLoweringObjectFileImpl.h llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp llvm/lib/Target/AArch64/AArch64InstrInfo.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index d0348f96a..6a171c3d4 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -6237,7 +6237,8 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
   if (Arg *A = Args.getLastArg(options::OPT_fsplit_machine_functions,
                                options::OPT_fno_split_machine_functions)) {
     if (!A->getOption().matches(options::OPT_fno_split_machine_functions)) {
-      // This codegen pass is only available on x86 and AArch64 ELF and Mach-O targets.
+      // This codegen pass is only available on x86 and AArch64 ELF and Mach-O
+      // targets.
       if ((Triple.isX86() || Triple.isAArch64()) &&
           (Triple.isOSBinFormatELF() || Triple.isOSBinFormatMachO()))
         A->render(Args, CmdArgs);

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https://github.com/llvm/llvm-project/pull/179449