[PerformanceTips] Provide context on the impact of assume(x)

Sean Silva suggested I add something here a while back.  Sorry it's taken so long to get back to this.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235826 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed