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from b609135fc92 [MC][ELF] fix newly added test new 8f99faa030c [x86] add and use fast horizontal vector math subtarget feature

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Summary of changes: lib/Target/X86/X86.td | 12 +- lib/Target/X86/X86ISelLowering.cpp | 22 +- lib/Target/X86/X86Subtarget.h | 4 + test/CodeGen/X86/avx2-phaddsub.ll | 36 +- test/CodeGen/X86/avx512-intrinsics-fast-isel.ll | 21 +- test/CodeGen/X86/haddsub-shuf.ll | 891 +++++++++++++++++++----- test/CodeGen/X86/haddsub-undef.ll | 410 ++++++++--- test/CodeGen/X86/haddsub.ll | 385 +++++++--- test/CodeGen/X86/madd.ll | 69 +- test/CodeGen/X86/phaddsub.ll | 616 +++++++++++----- test/CodeGen/X86/required-vector-width.ll | 6 +- test/CodeGen/X86/sad.ll | 238 ++++--- test/CodeGen/X86/vector-reduce-add.ll | 356 ++++------ test/CodeGen/X86/vector-reduce-fadd-fast.ll | 493 ++++++------- test/CodeGen/X86/vector-shuffle-combining.ll | 39 +- 15 files changed, 2378 insertions(+), 1220 deletions(-)