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from 44b0ebe PR 31534: When emitting both DWARF unwind tables and debug in [...] new a4ca999 ThinLTO: add early "dead-stripping" on the Index

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Summary of changes: include/llvm/IR/ModuleSummaryIndex.h | 19 ++++- include/llvm/IR/ModuleSummaryIndexYAML.h | 3 +- include/llvm/LTO/LTO.h | 7 ++ include/llvm/Transforms/IPO/FunctionImport.h | 13 +++- lib/Analysis/ModuleSummaryAnalysis.cpp | 31 +++++++- lib/Bitcode/Reader/BitcodeReader.cpp | 6 +- lib/Bitcode/Writer/BitcodeWriter.cpp | 1 + lib/LTO/LTO.cpp | 41 ++++++++-- lib/LTO/ThinLTOCodeGenerator.cpp | 42 +++++++---- lib/Transforms/IPO/FunctionImport.cpp | 103 +++++++++++++++++++++++-- test/ThinLTO/X86/Inputs/deadstrip.ll | 22 ++++++ test/ThinLTO/X86/deadstrip.ll | 109 +++++++++++++++++++++++++++ 12 files changed, 365 insertions(+), 32 deletions(-) create mode 100644 test/ThinLTO/X86/Inputs/deadstrip.ll create mode 100644 test/ThinLTO/X86/deadstrip.ll