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from c0cd92909ef [AArch64] make test immune to scalarization improvements; NFC new a9359267b4b [globalisel][combiner] Make the CombinerChangeObserver a Ma [...]

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Summary of changes: include/llvm/CodeGen/GlobalISel/CombinerHelper.h | 13 +++-- include/llvm/CodeGen/GlobalISel/CombinerInfo.h | 11 ++++ .../llvm/CodeGen/GlobalISel/GISelChangeObserver.h | 29 +++++++--- include/llvm/CodeGen/GlobalISel/GISelWorkList.h | 54 ++++++++++++++----- lib/CodeGen/GlobalISel/CMakeLists.txt | 1 + lib/CodeGen/GlobalISel/Combiner.cpp | 61 ++++++++++++++++------ lib/CodeGen/GlobalISel/CombinerHelper.cpp | 44 ++++++++++++---- lib/CodeGen/GlobalISel/GISelChangeObserver.cpp | 31 +++++++++++ lib/CodeGen/GlobalISel/Legalizer.cpp | 12 ++--- ...galizercombiner-extending-loads-cornercases.mir | 59 ++++++++++++++++----- .../CodeGen/GlobalISel/LegalizerHelperTest.cpp | 8 +-- 11 files changed, 251 insertions(+), 72 deletions(-) create mode 100644 lib/CodeGen/GlobalISel/GISelChangeObserver.cpp