Not all zero vectors are ConstantDataVector's. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@253723 91177308-0d34-0410-b5e6-96231b3b80d8
Terrifyingly, one of them is a mishandling of floating point vectors in Constant::isZero(). How exactly this issue survived this long is beyond me. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@253655 91177308-0d34-0410-b5e6-96231b3b80d8