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from f24aef8e06b [X86] Use isNullConstant instead of getConstantOperandVal = [...] new f066c9f7311 [InstCombine] make fold for icmp with sext more efficient; NFC new 098cc65f20a [X86][BtVer2] Use ReadAfterLd entries for the register oper [...]

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Summary of changes: lib/Target/X86/X86ScheduleBtVer2.td | 15 +- lib/Transforms/InstCombine/InstCombineCompares.cpp | 20 +- .../llvm-mca/X86/BtVer2/cmpxchg-read-advance.s | 286 +++++++++++++++++++++ 3 files changed, 305 insertions(+), 16 deletions(-) create mode 100644 test/tools/llvm-mca/X86/BtVer2/cmpxchg-read-advance.s