PGO: fix a bug in parsing pgo data.

When a function has a single counter, we will offset the pointer by 1 when
parsing the next function. If a function has multiple counters, we are
okay after skipping rest of the counters.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@201456 91177308-0d34-0410-b5e6-96231b3b80d8