[CostModel][X86] Add SHLD/SHRD scalar funnel shift costs
The costs match the typical reg-reg cases - the RMW case can be a lot slower but we don't model that at this level llvm-svn: 346683
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The costs match the typical reg-reg cases - the RMW case can be a lot slower but we don't model that at this level llvm-svn: 346683