[llvm] [CodeGen][SDAG] Remove Combiner WorklistMap (PR #92900)

[Simon Pilgrim via llvm-commits]

RKSimon wrote:

Love this!

Although I think it takes all the padding bits we'd be considering using to extend NumOperands/NumValues to U32 to fix #55737 etc. :( 

https://github.com/llvm/llvm-project/pull/92900