Some out of tree backend require larger vector type. Since maintaining the changes out of tree is difficult due to the many manual changes needed when adding a new type we are adding it even if no backend currently use it.
Most of this looks mechanical; I don't think the MVT changes should be contentious. However, the "is65536BitVector()" predicates are starting to get a bit unwieldy to read.
Does an out of tree target need these predicates? I feel they're sufficiently unreadable to either change the format ("is64kBitVector"?) or elide them for larger types.
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