ThinLTOBitcodeWriter: Emit __cfi_check to full LTO part of bitcode file. The CrossDSOCFI pass runs on the full LTO module and fills in the body of __cfi_check. This function must have the correct attributes in order to be compatible with the rest of the program. For example, when building with -mbranch-protection=standard, the function must have the branch-target-enforcement attribute, which is normally added by Clang. When __cfi_check is missing, CrossDSOCFI will give it the default set of attributes, which are likely incorrect. Therefore, emit __cfi_check to the full LTO part, where CrossDSOCFI will see it. Reviewers: efriedma-quic, vitalybuka, fmayer Reviewed By: efriedma-quic Pull Request: https://github.com/llvm/llvm-project/pull/154833
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