[llvm] [RISC-V][GISEL] Select G_BITCAST for scalable vectors (PR #101486)

[Michael Maitland via llvm-commits]

michaelmaitland wrote:

It looks like it is failing `64543: GIM_CheckFeatures(ExpectedBitsetID=47)`. Based on what I can tell, that occurs when we don't have the correct subtarget features. I thought you have specified the correct subtarget features though (via mtriple and mattr). I am continuing to look into it.

https://github.com/llvm/llvm-project/pull/101486