With LTO and profile-use, enable hotness info in opt remarks

This is to match the behavior of non-LTO;
when -fsave-optimization-record is passed and PGO is available we enable
the generation of hotness information in the optimization records.

Differential Revision: https://reviews.llvm.org/D27332

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@288520 91177308-0d34-0410-b5e6-96231b3b80d8