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82fb049153
Previously we tried to split them into narrower v64i1 or v16i1 pieces that each got promoted to vXi8 and then passed in a zmm or xmm register. But this crashes when you need to pass more pieces than available registers reserved for argument passing. The scalarizing done here generates much longer and slower code, but is consistent with the behavior of avx2 and earlier targets for these types. Fixes PR43323. llvm-svn: 372069
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