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from ba989e1b97f [InstCombine] -X / C --> X / -C for FP new 2fb7f37b947 [InstCombine] C / -X --> -C / X new d29c876d9ac [mips] Spectre variant two mitigation for MIPSR2

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Summary of changes: lib/Target/Mips/AsmParser/MipsAsmParser.cpp | 1 + lib/Target/Mips/MicroMips32r6InstrInfo.td | 6 + lib/Target/Mips/MicroMipsInstrInfo.td | 6 + lib/Target/Mips/Mips.td | 4 + lib/Target/Mips/Mips32r6InstrInfo.td | 39 ++ lib/Target/Mips/Mips64InstrInfo.td | 34 +- lib/Target/Mips/Mips64r6InstrInfo.td | 30 + lib/Target/Mips/MipsDSPInstrFormats.td | 2 +- lib/Target/Mips/MipsInstrFormats.td | 4 +- lib/Target/Mips/MipsInstrInfo.cpp | 21 +- lib/Target/Mips/MipsInstrInfo.td | 55 +- lib/Target/Mips/MipsLongBranch.cpp | 19 +- lib/Target/Mips/MipsSubtarget.cpp | 16 +- lib/Target/Mips/MipsSubtarget.h | 7 + .../InstCombine/InstCombineMulDivRem.cpp | 25 +- test/CodeGen/Mips/indirect-jump-hazard/calls.ll | 188 ++++++ .../indirect-jump-hazard/guards-verify-call.mir | 58 ++ .../guards-verify-tailcall.mir | 59 ++ .../Mips/indirect-jump-hazard/jumptables.ll | 649 +++++++++++++++++++++ .../Mips/indirect-jump-hazard/long-branch.ll | 138 +++++ .../Mips/indirect-jump-hazard/long-calls.ll | 104 ++++ .../indirect-jump-hazard/unsupported-micromips.ll | 5 + .../indirect-jump-hazard/unsupported-mips32.ll | 5 + test/Transforms/InstCombine/fdiv.ll | 6 +- 24 files changed, 1431 insertions(+), 50 deletions(-) create mode 100644 test/CodeGen/Mips/indirect-jump-hazard/calls.ll create mode 100644 test/CodeGen/Mips/indirect-jump-hazard/guards-verify-call.mir create mode 100644 test/CodeGen/Mips/indirect-jump-hazard/guards-verify-tailcall.mir create mode 100644 test/CodeGen/Mips/indirect-jump-hazard/jumptables.ll create mode 100644 test/CodeGen/Mips/indirect-jump-hazard/long-branch.ll create mode 100644 test/CodeGen/Mips/indirect-jump-hazard/long-calls.ll create mode 100644 test/CodeGen/Mips/indirect-jump-hazard/unsupported-micromips.ll create mode 100644 test/CodeGen/Mips/indirect-jump-hazard/unsupported-mips32.ll