[llvm] [LLVM][SelectionDAGBuilder] Add initial DAG for target("aarch64.svcount") constants to the node cache. (PR #126089)

[Craig Topper via llvm-commits]

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

I don't think this patch is needed and I'm going to remove the other NodeMap updates from getValueImpl.

https://github.com/llvm/llvm-project/pull/126089