feat: LLVM support for scalable vectors - #1359
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ok this is part 2 of some patches based on @zhengyang92's original work
this part adds LLVM/alive-tv support for scalable vectors.
we're still limited to a single vscale value per alive run-- multiple vscale is in the next PR.
testing isn't super extensive here-- I'd prefer to reserve extensive testing for later, once multiple vscale values are supported.
I went back and changed the classic-alive command line option to match alive-tv: single-vscale. the plan is to allow the user to specify at most one of single-vscale and max-vscale. but that's in the next PR.