[llvm] [SelectionDAG] Move INSERT_SUBVECTOR sign bits logic into SignBitsOps (NFC) (PR #226896)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-support

Author: Pkuyo (pkuyo)

<details>
<summary>Changes</summary>

Factor the INSERT_SUBVECTOR ComputeNumSignBits logic into SignBitsOps::insertSubvector so the GlobalISel side (#<!-- -->220976) can share it.  (NFC)

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Full diff: https://github.com/llvm/llvm-project/pull/226896.diff


3 Files Affected:

- (modified) llvm/include/llvm/Support/KnownBits.h (+12) 
- (modified) llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp (+6-23) 
- (modified) llvm/lib/Support/KnownBits.cpp (+39) 


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https://github.com/llvm/llvm-project/pull/226896