[RISCV] Prevent emitting vsetvli with e32alt or e64alt. (#191960) The e32alt and e64alt encodings for vtype are reserved. Non-fp instructions ignore altfmt and we want to use that to avoid vtype toggle when using load, store, slide, gather, etc. to manipulate bf16 vectors. This is why we have a Demanded bit for AltFmt. We need to make sure we don't keep the AltFmt set when we're changing SEW to 32 or 64. A new isValidVType function has been added to help catch illegal vtype earlier.
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