[llvm] [X86] SimplifyDemandedBitsForTargetNode - add handling for VPMADD52L/VPMADD52H (PR #155494)

[Simon Pilgrim via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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RKSimon wrote:

Please can you rename this combine-vpmadd52.ll - hopefully this will be the first of a number of related combines.

https://github.com/llvm/llvm-project/pull/155494