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from 099f3f878b5 Document the shortcomings of DwarfExpression::addMachineReg(). new 1ca28946c69 [Utils] Salvage the debug info of DCE'ed 'xor' instructions new 9c9e1cde863 [Utils] Salvage the debug info of DCE'ed 'sub' instructions new ca78c752ff7 [Utils] Salvage debug info of DCE'ed shl/lhsr/ashr instructions new 2bbd73403b7 [Utils] Salvage debug info of DCE'ed mul/sdiv/srem instructions new 957c7c76d11 Revert "Document the shortcomings of DwarfExpression::addMa [...]

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Summary of changes: lib/CodeGen/AsmPrinter/DwarfExpression.cpp | 16 ++-- lib/IR/DebugInfoMetadata.cpp | 6 ++ lib/Transforms/Utils/Local.cpp | 53 ++++++++++--- test/Transforms/InstCombine/debuginfo-variables.ll | 90 ++++++++++++++++++++++ 4 files changed, 147 insertions(+), 18 deletions(-)