Apply fix for LLVM PR51957 (Miscompilation in Botan's SHA3)

Apply fix for LLVM PR51957 (Miscompilation in Botan's SHA3)

Merge commit e27a6db5298f from llvm git (by Jameson Nash):

  Bad SLPVectorization shufflevector replacement, resulting in write to wrong memory location

  We see that it might otherwise do:

    %10 = getelementptr {}**, <2 x {}***> %9, <2 x i32> <i32 10, i32 4>
    %11 = bitcast <2 x {}***> %10 to <2 x i64*>
  ...
    %27 = extractelement <2 x i64*> %11, i32 0
    %28 = bitcast i64* %27 to <2 x i64>*
    store <2 x i64> %22, <2 x i64>* %28, align 4, !tbaa !2

  Which is an out-of-bounds store (the extractelement got offset 10
  instead of offset 4 as intended). With the fix, we correctly generate
  extractelement for i32 1 and generate correct code.

  Differential Revision: https://reviews.llvm.org/D106613