[Coverage] Remove deferred region for trailing return, fixes PR34611

As a special case, throw away deferred regions for trailing returns.
This allows the closing curly brace to have a count, and is less
distracting.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@313603 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit b3bac44cb354b63214b16fab24b5c0ffd392ec02)
2 files changed