a2c93b34df
This fixes the miscompile reported in #82430 by telling isSimpleVIDSequence to sign extend to XLen instead of the width of the indices, since the "sequence" of indices generated by a strided load will be at XLen. This was the simplest way I could think of getting isSimpleVIDSequence to treat the indexes as if they were zero extended to XLenVT. Another way we could do this is by refactoring out the "get constant integers" part from isSimpleVIDSequence and handle them as APInts so we can separately zero extend it. Fixes #82430 (cherry picked from commit 815644b4dd882ade2e5649d4f97c3dd6f7aea200)
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