David Sherwood 7edc7f6edb [CodeGen] Fix SimplifyDemandedBits for scalable vectors
For now I have changed SimplifyDemandedBits and it's various callers
to assume we know nothing for scalable vectors and to ignore the
demanded bits completely. I have also done something similar for
SimplifyDemandedVectorElts. These changes fix up lots of warnings
due to calls to EVT::getVectorNumElements() for types with scalable
vectors. These functions are all used for optimisations, rather than
functional requirements. In future we can revisit this code if
there is a need to improve code quality for SVE.

Differential Revision: https://reviews.llvm.org/D80537
2020-06-19 07:59:35 +01:00
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