Simon Pilgrim d2f0700f15 CONCAT_VECTOR of BUILD_VECTOR - minor fix
Fixed issue with the combine of CONCAT_VECTOR of 2 BUILD_VECTOR nodes - the optimisation wasn't ensuring that the scalar operands of both nodes were the same type/size for implicit truncation.

Test case spotted by Patrik Hagglund

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235371 91177308-0d34-0410-b5e6-96231b3b80d8
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