[InstCombine] Teach foldICmpUsingKnownBits to simplify SLE/SGE/ULE/UGE to equality comparisons when the min/max ranges intersect in a single value.

This is the inverse of what we do for SGT/SLT/UGT/ULT.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@314032 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed