[llvm] [ARM] computeKnownBitsForTargetNode for VMOVIMM/VMVNIMM Fixes #149276 (PR #171434)

[Medha Tiwari via llvm-commits]

medhatiwari wrote:

> Can you remove all the formatting changes and update the tests that require it, so we can see the differences. This might take quite a bit of work to work through the issues.

I've cleaned up here, now it shows only the actual code changes

https://github.com/llvm/llvm-project/pull/171434