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Summary: I have fixed several places in getSplatSourceVector and isSplatValue to work correctly with scalable vectors. I added new support for the ISD::SPLAT_VECTOR DAG node as one of the obvious cases we can support with scalable vectors. In other places I have tried to do the sensible thing, such as bail out for vector types we don't yet support or don't intend to support. It's not possible to add IR test cases to cover these changes, since they are currently only ever exercised on certain targets, e.g. only X86 targets use the result of getSplatSourceVector. I've assumed that X86 tests already exist to test these code paths for fixed vectors. However, I have added some AArch64 unit tests that test the specific functions I have changed. Differential revision: https://reviews.llvm.org/D79083
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