[InstrSimplify] fold sdiv if two operands are negated and non-overflow

Differential Revision: https://reviews.llvm.org/D49382


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@337642 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed