[ProfileSummary] Make getProfileCount a non-static member function.

This change is required because the notion of count is different for
sample profiling and getProfileCount will need to determine the
underlying profile type.

Differential revision: https://reviews.llvm.org/D33012

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@302597 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed