Revert "[X86] Fold BITOP(PACKSS(X,Z),PACKSS(Y,W)) --> PACKSS(BITOP(X,Y),BITOP(Z,W))"
This reverts commit a32d14fd. Causes crashes, see https://reviews.llvm.org/rGa32d14fd4c0a43c154f251df1ccfe57e8b0a711a.
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This reverts commit a32d14fd. Causes crashes, see https://reviews.llvm.org/rGa32d14fd4c0a43c154f251df1ccfe57e8b0a711a.