[X86][Btver2] Split i8/i16/i32/i64 div/idiv costs

We were assuming a mixture of 32/64 division costs.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@327407 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed