[TargetLowering] Add BuildSDIVPattern helper to BuildExactSDIV (NFCI).
As requested in D50392, pull the magic constant calculations out into a helper function. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@339346 91177308-0d34-0410-b5e6-96231b3b80d8
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