CodeGen: Handle CapturedStmt in instrumentation based profiling

CapturedStmt was being ignored by instrumentation based profiling, and
its counters attributed to the containing function. Instead, we need
to treat this as a top level entity, like we do with blocks.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@206231 91177308-0d34-0410-b5e6-96231b3b80d8