Christopher Tetreault 792f8e1114 [SVE] Take constant fold fast path for splatted vscale vectors ...

This should be a perfectly reasonable operation for scalable vectors.
Currently, it only works for zeroinitializer values of
ScalableVectorType, but the fundamental operation is sound and it should
be possible to make it work for other splats

Reviewed By: david-arm

Differential Revision: https://reviews.llvm.org/D77442

2020-11-17 12:45:31 -08:00

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