[llvm] Calculate KnownBits from Metadata correctly for vector loads (PR #128908)

[Nikita Popov via llvm-commits]

https://github.com/nikic requested changes to this pull request.

For vectors, the width of KnownBits should be the same as the width in the range metadata: Both are element-wise.

https://github.com/llvm/llvm-project/pull/128908