[OptDiag,LV] Add hotness attribute to analysis remarks

The earlier change added hotness attribute to missed-optimization
remarks.  This follows up with the analysis remarks (the ones explaining
the reason for the missed optimization).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@276192 91177308-0d34-0410-b5e6-96231b3b80d8
7 files changed