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from bd496c7 Revert r291645 "[DAGCombiner] Teach DAG combiner to fold (vse [...] new d27a39a [PM] Rewrite the loop pass manager to use a worklist and augm [...]

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Summary of changes: include/llvm/Analysis/IVUsers.h | 6 +- include/llvm/Analysis/LoopAccessAnalysis.h | 7 +- include/llvm/Analysis/LoopInfo.h | 13 +- include/llvm/Analysis/LoopPassManager.h | 408 +++++- include/llvm/Transforms/Scalar/IndVarSimplify.h | 3 +- include/llvm/Transforms/Scalar/LICM.h | 3 +- include/llvm/Transforms/Scalar/LoopDeletion.h | 3 +- .../llvm/Transforms/Scalar/LoopIdiomRecognize.h | 3 +- include/llvm/Transforms/Scalar/LoopInstSimplify.h | 3 +- include/llvm/Transforms/Scalar/LoopRotation.h | 3 +- include/llvm/Transforms/Scalar/LoopSimplifyCFG.h | 3 +- .../llvm/Transforms/Scalar/LoopStrengthReduce.h | 3 +- include/llvm/Transforms/Scalar/LoopUnrollPass.h | 3 +- lib/Analysis/IVUsers.cpp | 18 +- lib/Analysis/LoopAccessAnalysis.cpp | 29 +- lib/Analysis/LoopInfo.cpp | 7 +- lib/Analysis/LoopPass.cpp | 10 +- lib/Analysis/LoopPassManager.cpp | 188 ++- lib/Passes/PassBuilder.cpp | 12 +- lib/Transforms/Scalar/IndVarSimplify.cpp | 18 +- lib/Transforms/Scalar/LICM.cpp | 19 +- lib/Transforms/Scalar/LoopDeletion.cpp | 13 +- lib/Transforms/Scalar/LoopDistribute.cpp | 10 +- lib/Transforms/Scalar/LoopIdiomRecognize.cpp | 20 +- lib/Transforms/Scalar/LoopInstSimplify.cpp | 18 +- lib/Transforms/Scalar/LoopRotation.cpp | 17 +- lib/Transforms/Scalar/LoopSimplifyCFG.cpp | 14 +- lib/Transforms/Scalar/LoopStrengthReduce.cpp | 20 +- lib/Transforms/Scalar/LoopUnrollPass.cpp | 36 +- lib/Transforms/Vectorize/LoopVectorize.cpp | 7 +- test/Other/loop-pass-ordering.ll | 11 +- test/Other/new-pass-manager.ll | 27 +- test/Other/pass-pipeline-parsing.ll | 8 +- unittests/Analysis/LoopPassManagerTest.cpp | 1439 ++++++++++++++++++-- 34 files changed, 2015 insertions(+), 387 deletions(-)