[llvm] [X86] Remove TuningFastVariableCrossLaneShuffle from X86_64V4Tuning (PR #212178)

[Phoebe Wang via llvm-commits]

phoebewang wrote:

@222rohan I'm confused when looking at the configurations you mentioned. One mentioned AOCC and one ICC. Did you collect results from these compilers instead of community LLVM?

https://github.com/llvm/llvm-project/pull/212178