[CostModel][X86] Fixed AVX1/AVX512 sdiv/udiv uniformconst costs for 256/512 bit integer vectors

We weren't checking for uniform const costs before the general cost, resulting in very high estimates.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@284755 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed