[llvm] [RISCV] Disable fixed vectors in getOptimalMemOpType if minimum VLEN is 32. (PR #102974)

[Philip Reames via llvm-commits]

preames wrote:

> > At the moment, trying to use zve32x/zve32f is living very dangerously.
> 
> zve32x/zve32f are supposed to work as long as zvl64b or higher is also used.

Correct, sorry I should have been more clear about the dangerous configuration.  This review is specifically about the zvl32b case.  

https://github.com/llvm/llvm-project/pull/102974