[CGData][lld-macho] Merge CG Data by LLD #112674
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LLD now processes raw CG data for stable functions, similar to how it handles raw CG data for the outliner's hash tree. This data is encoded in the custom section (
__llvm_merge) within object files. LLD merges this information into the indexed CG data file specified by the-codegen-data-generate-path={path}option. For the linker that does not support this feature, we could usellvm-cgdatatool -- https://github.com/llvm/llvm-project/blob/main/llvm/docs/CommandGuide/llvm-cgdata.rst.Depends on #115750.
This is a patch for https://discourse.llvm.org/t/rfc-global-function-merging/82608.