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from cdceebe6b61 [DAGCombine] visitVSELECT - remove equivalent getValueType( [...] new be8955443d5 MemTag: unchecked load/store optimization. new 7c7f9d6e962 gn build: Merge r370490

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Summary of changes: lib/Target/AArch64/AArch64.h | 2 + lib/Target/AArch64/AArch64RegisterInfo.cpp | 29 ++- lib/Target/AArch64/AArch64StackTaggingPreRA.cpp | 209 +++++++++++++++++++++ lib/Target/AArch64/AArch64TargetMachine.cpp | 3 + lib/Target/AArch64/CMakeLists.txt | 1 + lib/Target/AArch64/Utils/AArch64BaseInfo.h | 4 + test/CodeGen/AArch64/O3-pipeline.ll | 1 + .../AArch64/stack-tagging-unchecked-ld-st.ll | 141 ++++++++++++++ .../gn/secondary/llvm/lib/Target/AArch64/BUILD.gn | 1 + 9 files changed, 390 insertions(+), 1 deletion(-) create mode 100644 lib/Target/AArch64/AArch64StackTaggingPreRA.cpp create mode 100644 test/CodeGen/AArch64/stack-tagging-unchecked-ld-st.ll