When marking declarations referenced within an expression (e.g.,
within a default argument), recurse into default arguments. Fixes
PR8401, a regression I introduced in r113700 while refactoring our
handling of "used" declarations in default arguments.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@116817 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed